So drill the benchdog holes through the MDF layer. Begin by laying out their positions. You'll want these to be precise, so that the distances between the holes are consistent. The vises you are using will constrain your benchdog spacing. My front vise worked most naturally with two rows of holes four inches apart, my end vise with two pairs of rows, with four inches between the rows and eight inches between the pairs. Because of this, I decided on a 4" by 4" pattern.
The holes we want to mark are the holes through which the threaded rod connecting the two legs will run. This threaded rod will run through the 3/8" groove along the bottom of the short stretchers,. The hole for the upper stretcher has to be positioned so that when the rod is running through this groove, the top of the short stretcher is even with the top of the legs. The most precise way I've found for marking the position of this hole is to use a dowel center. Fit the dowel center into the bottom groove, line up the stretcher, and bang on the end with a rubber mallet. The dowel center will leave a mark indicating the center of the hole.

For the most part, furniture restorers/refinishers/conservators in the United States lack the necessary hand-tool skills to do proper wood repairs. But avid readers of Popular Woodworking Magazine do possess the skills. Like me in the 1970s, you just need instruction on how to go about it. These books provide this. They greatly influenced the techniques I use in my shop, and many are shown in the “Repairing Furniture” video/DVD I made for Taunton.
First, we need to drill out the holes for the screws that will hold them together. While the two layers of MDF are glued, the countertop and the MDF will only be screwed. The oak countertop, like any natural wood product, will expand and contract with humidity changes. If it were glued to the MDF, the difference in expansion of the two layers would cause the countertop to buckle and curl.
Chris I blame you for all these altars that are being built today and now you thinks we over thinks ’em–huh. You whipped the masses into a frenzy— now Woodworkers are trying to out pretty each other–out wood species each other –out Rube Goldberg each other. I made 2 benches in 30 years neither had a through dovetail but many were made on them and I have no idea but I would bet a dollar that neither weighed 280 pounds but they both had tons of wood on them. If you want the bench as a destination god bless but it was intended as a mean. Thats my rant I could be wrong

 6. The Complete Book of Woodworking by Tom Carpenter. Another great reference book you'll come back to again and again. The latter half contains a bunch of projects you may or may not end up making (I bet you won't) but the details covered in the first half are as good as any overview-style book I've come across. When I want to make sure my process is up to snuff when I'm working on a ManMade post, this is the one I check first. 

In the "Getting Started with Woodworking" video, the holes through the 4x4's were drilled from the back. That is, they start on the side opposite the precisely-positioned mark, and drill through to hit it. If they can do this, more power to them, but I can't drill through 3-1/2" of wood to emerge at a precise mark without a drill press - and not always then.
While $115 may seem expensive, try accurately boring a grid of 20mm holes on 96mm centers in 3/4 MDF. I have for a table for our retirement community shop - - its a pita. Plus the MFT material seems denser and more water resistant than garden-variety MDF. And the single-thickness has proven sufficient the last several years on my original 1080s. Still dead flat.
If you remember, when drilling the MDF I finished the holes from the other side using a Forstner bit. It made for a clean hole, but the positioning wasn't as precise as I really wanted. So for this, I decided to clamp a length of scrap MDF to the back side, and to drill straight through. My Forstner bits were too short, so I bought an extender. And then I found that the spade bits I was using gave a cleaner exit hole. Whooda thunk?
Workbenches have flat tops, though sometimes at the rear there is a cavity called a tool well that contains tools and components (and prevents them from falling off). One advantage of having the well set into the top of the bench is that, even with a variety of objects in the well, a large sheet of material can still be laid flat over the entire surface of the bench; the contents of the tool well offer no interference.

“The Complete Guide to Woodworking features detailed plans for 40 stunning projects for woodworkers of all levels, plus more than 1,200 step-by-step illustrations. It also includes expert information on setting up a workshop, safety, how to use and look after tools, and much more. For beginners and experienced woodworkers alike, this is the ultimate step-by-step guide.
This bench suffers from no such limitations as it provides an incredibly solid and stable workspace, albeit in a somewhat stripped down version. In terms of performance, Sjobergs tops our list at providing 80 lbs of weight capacity. This is one of the more quantifiable measurements to determine the quality of a work bench’s craftsmanship. This is achieved by using thick pieces of European birch wood and working it without using lower end joints – like butt joints.
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