I'm not really sure what to say here as I don't see any significant advantage to having a normal-sized cab that comes apart into two pieces. I have moved every cab(*) in my basement myself using a basic appliance dolly. I'm not overly big or strong (although I can apply a bit of leverage at 6'2" and 225lbs) and my main issues are always getting around corners. For my part, I would prefer to suffer the extra exertion rather than have to remove the monitor and have to disassemble when I want to move a cab.
* - The one exception is a Dynamo Showcase, which, at 800 lbs, was too heavy and too big for me to move without disassembly (and I will NOT be disassembling it again -- it's going to stay with the house if I ever move).
I guess, however, that for those who don't have/want a dolly or ready access to "cab relocation buddies", that there may be something to be said for the two-piece design.
Having said that, I would NOT cut an existing cab in half and hope to secure it with something like panel clamps.
You might want to consider building a slim cab -- the work that Knievel, spacies and others have done there have convinced me that it is a good alternative to a full-size.