I was using 2-1/2" coarse Kreg pocket hole screws. Kreg screws are supposed to be self-tapping, but the coarse-thread screws are intended to be self-tapping in softwood, and the fine-thread screws they intend for use in hardwoods aren't available in 2-1/2" lengths. I decided to drill pilot holes in the oak. Just to make sure, I did a test hole in the scrap piece I'd cut off.
1. In this post, you kindly remind us not to make it too deep or worry too much about the height. I presume you still believe a bench cannot be too long or too heavy? I’m with you — just asking if that’s actually still your opinion, since the bench above appears to be yet another six footer. (If longer is better, why don’t you build an 8 or 10′ for your home shop?) TYIA – remember, I’ve bought all my lumber to start my new bench, but I haven’t milled anything yet, so you’re really helping in an immediate way here!

I don't see anywhere you mentioned the over all length of the bench top. A piece of 1 1/2" x 25" x 8' glued edge oak at Lumber Liquidators costs $192 including tax. Two piece is almost $400! Would that be better if I use two IKEA 1 1/4" x 25" x 74" solid Beech ($99 each plus tax) on top of a layer of 3/4" Birch plywood. That would be 3 1/4" over all.

I can't recommend this place highly enough. As someone who wants to test the waters in the hobby of woodworking this is the perfect place. They have all of the tools you need to complete your project, and they are great with helping beginners. I began as a skeptical customer but the staff was super ready and willing to make sure we could rectify a misunderstanding.
A woodworker's Workbench is a special type of bench designed to hold your work when you are working on a wood project. The main purpose of this table is to keep the woodwork steady and to prevent it from moving. Follow the tutorial below to build yourself a nice workbench suitable for your specific woodworking projects. Make sure to modify the table to fit your specific requirements.

I made a template by scribing two adjoining squares on a piece of MDF, using compass and straightedge, then marking each corner with a centerpunch, then drilling the points with a 1/16" bit. I find I'm always breaking small bits, so I picked up a couple of each size some months ago, and on looking I found I had three 1/16" bits, which worked fine for what I intended.
@cahudson42 I bored the holes in my sandwich top with a 3/4" power auger bit with the drill in a portable drill guide that kept it vertical and in a way a bit like a plunge router. The guide screw of the auger was dead easy to centre over the laid out grid points. The holes are dead straight and clean sided. The auger bit was new which probably helped. As stated I have three rows from an end vise running the length of the front as well as from the front vise and holes in the front apron to support long pieces as well.
Get perfectly, consistently spaced and centered shelf-pin holes! Economical and practical, this jig can be used on assembled or unassembled cabinetry. Re-designed handle includes two storage compartments for self-centering bits! Ideal for adding shelves to new or existing cabinets. Drills holes either 1-7/16" or 2-1/2" from edge. Insert shelf pin in top or bottom position to extend jig for continuous drilling. Shelving Jigs measure 20" long Additional Self-Centering Bits available. 
As I was handling the 2x4's, during the routing, I realized that I really wouldn't be happy with the look of the bench, if it were made from these unfinished boards. They had stamps, pencil marks, and more importantly, incipient splinters left by the saw, none of which I wanted. And I was remembering what other shop furniture made from unfinished pine had looked like, after a few years in the grime of a shop.
Having done all this, I'm not sure I'd do it this way again. It might well be faster to layout the positions with compass and straightedge directly onto the top. Either way, you'll want to use a scribe rather than a pencil. Scribe lines are hard to see, and impossible to photograph, but the scribe and compass points click into them, allowing a precision that pencils simply cannot match.
Post Woodworking’s Hampton shed is a major standout in design. The sleek farmers porch immediately draws the eye into its pure New England charm and provides the utility of shade and a cool place to sit and enjoy a cold one. Like all of our sheds, the six-panel doors which add to the structure’s aesthetic come standard. They’re made out of fiberglass to last through many decades out in the elements.