high bro, i'm not sure if i understand your questions correctly but if you're asking
can you do 2 rooms with one filter the simple answer is yes, the question then
becomes 'do i want to?' and i'd have to advise against it as i understand it.

can you post some pics so we can see what you're talking about?

btw, unless you have some really stinky strains, you probably won't need to
filter the exhaust from your mother area and if you do, you can DIY something
small and seperate.

if you haven't built it yet, you could get an armoire like cabinet and just build
the flower area on the bottom and the mother area on top, or vice versa.

oh yeah, if you break your paragraphs up as i have done it will make reading
and understanding your questions much easier.