Are you talking about something like these?
UpsidesQuicker assembly
Easy knockdown if you need to move it
Clean look from outside of cab
Stability will be just fine - won't be a worry, although you may need a few more along the long backside
DownsidesPrice per connector (dunno your source, but those run between 5-10 bucks per, depending on size)
Time involved in making sure alignment is correct
Tools required for installation kinda pricey (forstner bit) but only a one-time buy
May still require screws along backside of cab due to size, or require 2-3 more connectors
PITA screwing in the bolt part of this connector -
YOU MUST PREDRILL THE HOLE FOR THE BOLTOther options would be to just use screws on the outside of your cab, but use a countersink bit to set the screw heads even with the top of the cab....it sucks to have to do it, but with a R/O sander, it truly isn't that much work to get a clean surface again.
If you're using plywood, you could use 1x1's and screw from the inside .