Thanks for the replies.
Martin
Filing cabinets are indeed impressively strong. I guess they have to be given that paper by the yard is 'kin heavy and standard operating conditions in old-line offices seems to be well overfilled.
Actually that's the fall back option as the existing storage is a 2 1/2 drawer deep unit made by transplanting two whole and one cut down to half height drawers into a simply plywood box on wheels something like 30 years ago. Replacing the plywood box with a nice 1' square steel tube frame should produce something amply strong but the drawer sizes and depth aren't really a good fit for tooling et al. I lucked into a goodly quantity of British made ex civil service 4 drawer filing cabinets on a "free if you haul basis" about 20-25 years back and put them to good use after suitable surgery. One cut done to two two drawers and bolted together with a blockboard, ex civil service desk, top makes a nice low level bench. Three more cut down to three drawers with similar material on top makes a nice high bench. Three more crude ply boxes on tiny wheels with 2 1/2 drawers in each sit neatly under my steel bench and can be pulled out to get at the stashed at the back treasures too good to bin, albeit not seen for over a decade! As the drawer sides are half height most of them carry a pair of half length half height lift out trays cut from surplus drawers ( I said I got a lot didn't I) 't give a better fit with tooling and general stuff sizes. Half lemng 'cos full length is tricky to get out and probably too heavy anyway.
pgk pgk
I see where you are coming from but I'm trying to get away from makeshifts. Now the big 60 has been and gone I'm finding nice more desirable and spending, within reason, less painful than it used to be. Got good mileage out of ex-kitchen cabinets with angle iron reinforcements and similar expedients in my dank and dirty past tho'.
Clive