i built a counter top for my wife’s BBQ hut out of 2x4’s. I trimmed the sides on table saw to have straight edges and then biscuit joined, glued and clamped together. When finished it wa flat with no rounded edges on 2x4s To catch grit.High shelves, ladder accessible for stuff you never use and can’t part with
Plywood on top of the 2x12 benches
Smoother and replacible when shot
Nothing expensive or heavy just smooth and sacrificial
Also give the bench tops a generous front lip so you can clamp to them
Toe kicks trimmed to the floor on the work benches to keep a critical component from rolling under the bench and evaporating
Extra lights over the work benches
If you don’t have a 220 v plug add one near the door
Tie you biggest bench to the wall and put a stout vise on the corner
A barn door track on the bottom of the truss with a light hoist that runs in the track for lifting 300 lb class stuff onto the bench or out of the pickup bed. It will save your back.