animal plastics has cages with optional dividers too & depending on the size of the cage i believe they're a little cheaper then monstercages.
i dont think the dividers are perforated in any way but you can email those questions to (or even call) the people at the sites, they have contact info. all those Q's can best be answered by them really, unless you catch someone here who actually has the set up your inquiring about.
i'm also looking into an NPI 36" stackable for my bp when she outgrows her current cage.