Hello - Joined to create a very large center channel to match my LRs

Hello -- I am Seth -- and I have an unconventional home setup (using JBL Pro speakers).

My man lair serves a triple purpose -- gym area, desk area, "theater" area. In the cinema portion, I have two PRX712s (which will eventually be SRX812P) and two SRX828Sps underneath for thumping (and boy, do the thumpers in Dune sound awesome).

Basically, I'd like opinions on a center channel -- I'm still learning how all of this works -- but, I was hoping to be able to replicate the SRX812Ps. Basically, take the 2432H compression driver and sandwich it between two 2272F 12" drivers. A bigger box to compensate the additional woofer, and bam, massive center channel for my massive LRs. (Don't ask me about side and back surrounds yet -- I have no idea what to try there).

But, yeah, I'll post in the appropriate forum for advice -- but feel free to comment here if you'd like.

What I'm hoping my equipment list will be in the end:
-SRX812Ps for LR (currently PRX712s)
-SRX828SPs for front subwoofers (there's not room for them anywhere else to even check if they sound better -- but that's alright -- they sound pretty great so far)
-Denon x3800H (coming tomorrow)
-Some bluray player -- most likely the mid-level Panasonic ($400 pricepoint, whichever that is)
-Sony X90L 65" (will be getting soon)
-Custom center channel to match LR
-Side and back surrounds (eventually)
-Possibly a 24" HS24 subwoofer for below 35hz -- we'll see . . .