"Don" writes:
If you double up the 2x4's you'll be alright as long as you're not pounding
stuff with a sledge.
Using 3/4" plywood for the top helps stiffen it all up.

or better yet, skin both the top and bottom of the 2x4's with plywood.
Google for "Stressed skin platform" or "torsion box"

When a piece of wood sags, the top radius gets smaller and the bottom
radius gets longer. With wood on both sides, the top sheet takes the
compression force and the bottom sheet takes the expansion force. This
makes for a *really* stable surface.

I'd guess that 1/2 on top and 1/4 on the bottom would be stronger than
a single 3/4 in piece on top. Then you can screw a 1/4 inch sheet of
masonite on top for a durable/replaceable/glue resistant worktop.

good luck!

--
be safe.
flip
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