This may be a bit late to post, but from my experience working with MDF, screws would be a BEEEEG mistake. I'm not sure how long it would take before they would loosen up and the cab would wobble, but I can tell you that after a few assemblies/disassemblies the holes will be pretty much stripped. I paneled my nursery wall a while ago with MDF (yes painted

) leaving a panel screwed in at the top for access to the attic. After a few removals, the screw holes in the MDF panel are about as smooth as a drinking straw. The panel wouldn't hold at all now, were it not for the 2x4 stud behind it which the screws can bite into. Ironically I had actually considered a reverse orientation of the bolt arrangement Shmokes just posted, but for the small number of times I need to access the attic crawlspace-decided it was overkill. I think it would work well for your application tho. I would add that you might be better off using washers and hex nuts instead of wing nuts however. This would allow you to get a matching socket for your drill and power bolt thru the assembly/disassembly.

Obviously this would A) save you HUGE amounts of time, B) allow you to tighten the sweet bejeezus out of the nuts - MUCH more so than by hand, and C) save your fingers from collegiate onset arthritis. (I'm guessing you won't get much gameplay in for a while after tightening all those nuts). Just my 2 cents.
I built about 50 linear feet of fence this way for my garden - countersinking all the bolts - and it's purty damn solid- holding 6 foot spans of clear heart redwood.
Oh BTW- you may also consider using piano hinges along one edge of some panels so you can fold/collapse at least part of it. Much, much stronger than a few bolts and an easier assembly/disassembly process besides.
