I'm still using one I built around 1978.

It had a 2 X 4 frame with a top of two layers of 3/4 mdf. There was a
back 8 inches where there was only 1 layer of 3/ 4 mdf in order to have
a depression for small parts. I sealed it with polyurethane. It has
been spilt on, pounded on, and moved cross country in a moving van with
stuff stacked on it about 3-4 times.

Ugly but still going strong and I have never replaced the top. It has a
bottom shelf and a double back rail with slots for putting bladed tools
down into. Works for me.

RonT