I'm working (in stages) on a big work bench and storage unit to go the full length of the back wall of my shop. I originally planned a single monolithic steel top bench 56 feet long. I've since decided to make it semi modular because somebody will want to disassemble and sell it. Probably at the estate sale after I die.
I also asked my wife if she had any ideas about how to get more out of it. She made what is actually a fantastic suggestion. Put 6 or 8 foot long wing benches in every 8 feet. This allows me to my 8 foot modules with drawers one at a time, and in the long run will increase the bench top surface by nearly 1.5-1.8 times. Sure that's more surface are to suffer from HSD (horizontal surface disease), but it means its also more space to pile up things out of the way to make room for the current project.
I have some steel tube (its pretty expensive right now), and I have 1/4 inch steel plate for the entire project.
Drawers are the problem. I can make plywood drawers (probably one or two at a time unless the price comes down) that will easily manage hundred of pounds. More specifically though drawer slides are the problem. I recently found a source for 250lb 30 inch slides at a pretty reasonable price. I think the seller wound up with a huge surplus lot. I've purchased 32 sets so far, and will purchase a probably that many more. Now what I am looking for are LONG ASS HEAVY DUTY drawer slides for the wing benches. I think 60 inch is a minimum, and 72 would be better. I've found a fair number of 60 inchers. The good news is every set I've found is rated for 500lbs. The bad news is every set I've found is relatively expensive. I may not do all the wings that way, but I hate to create dead space in the middle of all this investment either. I'd like to setup at least one 6foot wing with slide out drawers/trays for storing six foot stock. Long stock will probably still have be stored outside for now.
Now before any of you all go off and tell me about buying a hodge podge of desks, file cabinets, and bins at auctions and yard sales... for the purpose of this I just don't care. I want something better than that. I have a hodge podge of stuff already, and that will probably all go upstairs over my office.