Do you really need drawers? Over the years I've pared down from full sliding drawer setups to a simple false floor/deck, with (quality)plastic tubs as 'drawers'.
Remove the tubs when not needed.
Have extra tubs pre-packed for different tasks (camping, day beach trips, dives etc)
Every time you pack something into a box, into a box, into a drawer, you waste space.
I've used a few different techniques. Welded steel frames, alloy tube with those knock-in joiners, or just ply. If you use a separate frame, the ply can be quite thin. If all timbe, you need thicker ply for rigidity.
To knock up something fast (which I did three years ago as 'temporary' measure.....) I use aluminium angle, 8-12mm ply for vertical sections, and 15-18-22mm ply for the deck (depends how much support it has underneath) The alloy angle is bolted along every mating edge and forms a very good straight edge so your ply cuts don't need to be dead accurate.