I built some really nice lab benches using the laminated “butcher block” tops. One has a 48”x72” work surface to accommodate deep test equipment and still have 24” of working depth. A 24”x72” shelf on top of that for more equipment. With the butcher block you don’t need additional framing for support. Just sturdy legs at either end.
https://www.globalindustrial.com/g/work-benches/components/t...