I like 1 1/2" plywood for a top, with some overhang that will allow you to use c clamps on.
It is a good idea to put benches along at least two walls with 16-20' of total bench top, shelves above and below, leave room for gun safe, TV on wall. You will use all the bench top sooner or later.
clean guns in the garage, a gun caddy like this works well at home and in the field:
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These can be made out of simple plywood scraps, gas pipe screw together legs so that all cleaning supplies and legs fit in box. The piece of flat stock on top is used for sitting a simple gun vise on, mounting scopes, and bore sighting.
Case trimmers, grinders, etc can be mounted on a piece of plywood or 1x10", c clamped to bench top when needed, removed and put out of sight on a shelf when NOT needed. Same with Shot shell loaders, dillons, etc. This will free up bench top for more junk. More junk is a good thing, not a bad thing.