Thanks for all the replies. I love the idea of making one, and I'm wondering if I can do with my little $99 Harbor Freight welder. Shoot, I welded a couple parts back on a plow once with the thing, so it might worth a shot using some angle iron. Worse I'll do is make scrap iron into more scrap iron.
A lot of times I'll use the panel cutting option at the local Home Depot. It's amazing how much attitude you can get from a high school kid on a Saturday because you want a couple sheets of plywood cut down. If I had the room for a larger rack then I'd definitely consider one of those, but I don't work with full sized sheets enough to make it worthwhile in taking up space full time.
My shop is in the basement. I'd like to say I have the whole basement (about 1900 square feet) but I'd have to get rid of the ball-n-chain to get that. Of course, if I dump her I probably lose all my toys as well.
The good thing is that I have enough room for a table saw, compound miter saw, and then a unit that holds my drill press, sanders, bandsaw and of course the routers. I also have a nice size work bench in the middle of the room where I do most of my assembly work. The bench is 48" x 30", and I was thinking of adding an extension on it (48X60). Even with that, I still have enough room to maneuver a full sheet of plywood onto the table saw. The problem is just getting old, and I don't lift 3/4 inch sheets like I used to.
Oh well, I think I'll spend a couple more days trying to figure out what I want, and since I don't have any plans to buy full sized sheets in the near future, I've got a little time.