The last thing is to semi-permanently attach the bolts for the vises. Given the amount of work necessary to get to the bolt heads, once the top is joined, I had intended to tighten them up so they wouldn't spin, and lock them that way with blue Loctite. (That's the strongest non-permanent grade.) That didn't work. What I found was that the bottoms of the countersinks weren't quite flat, and when I tightened the nuts down that far, the ends of the bolts would be pulled far enough out of alignment that the vise bases would no longer fit. In order for the vises to fit over the bolts, I had to leave the nuts loose enough that the bolts had a bit of wiggle - which meant that they were almost loose enough for the bolts to spin. So I put Loctite on the nuts, to keep them from unscrewing, and filled the countersinks with Liquid Nails, in hopes of keeping the bolts from spinning. I considered using epoxy, or a metal-epoxy mix like JB Weld, but I didn't have enough of either on hand. It seems to be working for now, though the real test won't be until I have to take the vises off.
to allow 9' at the peak, I like a "shed style" roof, but that may not fly in your HOA.I'd put double doors on or one large one, pour a slab, or use patio blocks then lay down Wolman. plywood for a floor, I would use foam insulating board everywhere I could, walls, floor and ceiling. A few bin type windows or sliders would let in light and fresh air. If you can't get away with your wiring idea, I would use a HD 30 amp twist lock extension cord with an "outside weatherproof outlet" mounted on the home professionally installed for code, 2- 8' long flouresent lights, and a 20 amp outlet inside for a heater and dehumidifier. Dehumidifiers draw about 5-6 amps. You might be better off with a small 6000 BTU window or wall mounted AC unit,( $100 on sale at the Depot), it will take the moisture out of the air and cool it as well in the summer. I'd use thin wall conduit around the shop with about 4 double duplex boxes. You may be able to bring 220v. in and then split into 2-120v circuits. If you make ANY dust in this confined space you must first catch it with a shop vac, then filter the air, and wear a mask. A bathroom ventilator fan would exchange the air and be quiet. A slab in front would allow sawing outside weather permitting. A roll up canopy over the door way would provide "shade" and rain protection. I know this sounds like a lot of work, but I know you can do it if you try. You can get plenty of "free" advice here and from an expert close to you. My neighbor enlisted the help of a handyman for building his 2 sheds and they became friends and did tool swaps and labor trades for time worked. My advice to you.. go 4 it! bill
Evidence of a removed fireplace makes it clear that the woodworkers were doing tasks that required warmth, like using glue. The type of glue used during that time had to be heated to a certain temperature. Bill Flynt, a former colleague of Garrison, tested the wood of the shop and found that it is second- or third-generation wood, meaning that New Englanders had already cut down and replanted lots of trees by that time.

Something like this really does look like it would be a fun project. I guess I need to go out to the yard and use some stakes and brightly colored taped to mark off some different dimensions (12x8, 12x10, 12x12, etc.) to figure out just how big I can make this thing. If I'm building it myself, it'll be easy to keep the height right at the 9 foot limit.

A woodworker's workbench isn't a table, it's a work-holding system. It's not something you set things on top of, it's a tool that holds your work. Where a worktable might have a machinist's vise bolted to its top, a woodworker's bench is built to accommodate a number of different workholding mechanisms, such as bench dogs, planing stops, hold fasts, or board jacks, and will usually have one more woodworker's vises integrated into its structure.

A better solution would have been to route a rabbet into the side, so that the added strip always had thickness. The way I did it means that the strip I glued in is very narrow, and hence very weak, at a certain point. In this case, that's not a problem, because it's going to be sitting under the countertop layer. I also noticed that because I had only clamped the strip down, and not into the edge, there was a noticeable glue gap where the strip butted up against the MDF. Again, in this application it isn't visible. But if I was doing something like this on the top of a table, I'd make sure to cut a clean rabbet, and to clamp both down and in.
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You may even want to put yourself in the picture. If your workshop space already exists, find a large piece of cardboard, wallboard, or plywood that’s about the size of the workbench top you envision. Find a couple of stools or chairs, perhaps a few books, and turn them into stanchions to support the “benchtop.” Is it too big for the space? Is it large enough for the tasks you envision will be performed upon it?

Of course, few benches can be ideal, and this one does have some drawbacks. That being said, most of the disadvantages of this bench are minor annoyances rather than deal breakers. For instance, this bench does not include any kind of storage whatsoever. Though, it does have the option of adding numerous additional features like a storage area. Still, for the bench, you would expect a drawer at the very least, maybe a shelf below the main table area.
2 - use a plunge router with a bottom bearing cuter bit such as this from rockler: .... I thought to use the short one as I plunge it directly downward in the centre of the hole until the bearing reaches within the tabletop hole. I suppose one could use a long one, but the stubbiness seemed more practical (the big bearing ensured accuracy?)
My wife has given me the OK to buy a "Rancher"-style shed from Lowes and have it installed in the backyard. The discounted installed price will be about $2,600 and this includes the 12' x 8' structure along with a lot of upgrades (twin metal doors, a window, 2 skylights, storage, vents, etc.). I can save about $300 if I build it myself, but my skill level isn't there yet, so I'm going to pay Lowes to assemble it. (See Post #12 below for some photos of the shed and the space I have to work with.)