No plans I just pieced mine together one day. But a few suggestions that were given to me, that I will pass on.
Make it at a good working height for you while you are standing, buy a proper height stool/chair so you can sit and work, mine are 41".
I used two sheets of 3/4" sanded plywood glued togther with 'SikaFlex' adhesive, way better stuff than liquid nails and such. then years down the road you can unscrew the top and flip it over and have a brand new surface. With this 1 1/2" top you can set a transmission on it with no problem, as long as you built the rest strong enough.
Make it plenty deep, 3' if you have the room, if not cut it down as needed.
I added a storage shelf to mine, I just ran 2x4s length wise and then used the 1' pieces of 3/4" plywood that I cut down for shelving. I put this shelf so that I could place plastic storage tote crates under the bench on the shop floor. I then store tools and other items on the shelves.
I never thought of Formica, I like that idea!!!
steve