How much room is there underneath the control plate? I've been thinking of buying a Skyline JO5, and the reason I'm wondering this is because I'd like to know if I would have enough room to install an active preamp & battery inside it without having to do any routing. I may just keep it passive, but I've become so used to onboard preamps that I would like to be sure that I'd have the option to add one later if I decided that I couldn't live without one. So what do you think? Would an active preamp (most likely an Aguilar OBP-1) and a 9v battery (or two) fit? How about a push/pull pot, would that fit?