Semi trailer manufactures use flooring that looks just like bowling lanes for their dry van trailers. I would check semi trailer repair shops, they might even have some cut off piece's laying around you could get for cheap. They should also have Apitong (some people call Filipino flooring) for flat bed trailer use, that when finished, looks almost to good for a work bench.
Bowling alley wood lanes have metal inside them making them hard to cut - but make nice bench material when you can find it. I'm in the trucking business and have yet to get a good lead on some trailer floor material from my trailer repair shops. Rail cars have the same type of flooring but the same supply issues come up. And when it does it's pretty gnarly and beatup from forklifts. It gets grabbed faster than you can spit.
I settled on flat surface solid core wood doors. I asked my son (a building maintenance exec) and he got me two of them free. I expected them to be standard size but are actually nearly 9 ft. tall each weigh more than I can lift! I plan on cantilevered mounts made of 3"x3"x1/4" angle iron bolted to the studs and the concrete floor. I also plan on hanging drawers that came from office cubicles under the bench all along the bench. I still have not decided on what to edge the bench with with - maybe 1/8" flat stock. I think I'll leave the door handle hole at the wall and use it with my shop vac for sweeping debris into - using some king of cap to cover the hole when not in use - maybe a glass doorknob just to be unique.
I will chronicle my build here - but it will be later in this year. I have a lot of projects in the works.
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and yes its a mess. My little bro doesn't know how to work in a clean environment. but ti be fare to him the bench with haft my 3.0l on it was not all his fault 
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