motherplants are easy to maintain - you give it a SMALL pot, a plastic cup is enough and put it in a box (made of whatever you have handy - wood, metal, cardboard), cover it with reflective materials, put a 23W CFL on top, punch in a small PC fan (just about any will do, even thoes 1" fans) and cut a passive intake (and lightproof it)
with that done you could put the box just about anywhere.
remember that the whole thing needs to be 100% lightproof if you put it in a flowering chamber.
I like to put it on top of a tray full of soil and water than soil so the plant needs less occaisonal watering.
You could also take cutting from your huge plant and grow em in small pots to limit growth and use them for the next round and so on.
if you give em small pots and use less light than usual combining with some tying techniques you should be able to slow their growth to even 2 months until the flowering room is free.
anyhow - CONGRATULATIONS