Be careful. Single 24x60" sheets of 3/4" MDF are pretty easy to lift. A doubled sheet is manageable. The countertop - 24x72" panel of 1-1/2" oak - weighs something over 100 pounds. It takes real care to lift safely. The joined top - 3" thick of oak and MDF - is past the range that can be lifted safely by one person. Don't try. Get a friend to help, or rig a block-and-tackle.
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.
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?)
The Handy Home Products Berkley 10 ft. x The Handy Home Products Berkley 10 ft. x 16 ft. Do-It-Yourself Wood Shed Kit Combines charming country style and outstanding performance for the ultimate powerhouse. Offering maximum storage this woodshed is the ideal solution to house all your outdoor tools and lawn gear. Featuring 2x4 wood framing it boasts a ...  More + Product Details Close
Well, not these plans. You have the option of building a very functional and spacious lean-to shed on different foundations. Your foundation choices are: concrete slab, a wooden floor supported by concrete piers, or a wooden floor supported by skids. That lost option also means that your lean-to could be mobile as well so you won’t have to decide where you want to permanently put it.
As simple as its elements are, the workbench is more than a tabletop with legs, a well, and a few holes. Virtually everything in the workshop comes to rest on the bench at some point, even if only between operations at other stations. Planning and layout, cutting and shaping, assembling and finishing–all can be, and often are, performed on the benchtop. The better the design, and the better suited its size and configuration to your labors, the more efficient a tool it will be.

The bench would end up being about 5 feet long. I thought about cutting 5 feet out of my 8 feet long countertop and use the rest for a small support table. However, after a consideration, I decided to bypass the front vise altogether together with the overhang so my bench will be 4 feet long. This allows me to skip the MDF and just glue the two halves of the 8 feet board together.
Put the countertop on the base, put the MDF on top of the countertop, and line up the marks you drew on each end of the MDF with the countertop below it. When you have it lined up, clamp things down, and route the edge of the MDF using a 1-1/2" or longer flush-trim bit, with the depth adjusted so the bearing rides on the countertop. I clamped a couple of scraps of doubled MDF at each end to give the router base something extra to ride on at the ends.
I ended up making a number of practice cuts. The first revealed that I hadn't tightened the screws on the edge guide enough. The second revealed that the design of the edge guide provided very little support at the end of a board, because of the cut-out for the router bit. In the "Getting Started in Woodworking" video, they had screwed a piece of hardwood to the edge-guide, to provide a continuous -- and longer -- bearing surface. I may do that myself, some day, but I didn't have the materials at hand, so I clamped some 2x4 scrap to the end of each board, to provide a continuous bearing surface past the ends. The two grooves in the long stretchers and the side groove in the short stretchers have identical layout. I made practice cuts in scrap until I had the edge guide set correctly, then I cut them all with that one setting. The bottom groove of the short stretchers uses a different setup, so it was back to the scrap, before cutting them.
Out of all the shed books I have read, this book stays by my side while I hammer in the yard. The book is well written by what appears to be a non professional book writer (A Good Thing). It reads as if you are getting advise in laymans terms from your neighbor "The Craftsman", a welcome change from the DIY books, that assume a level of expertese. The level of detail is high and discusses gotcha's, advise, and trade "secrets" that could have only come from years of personal experience building sheds.