So, I am doing some work in the main room. Conduit behind the walls, for future runs, with new electrical with proper grounds.

I want to place an 18" woofer on either side here. I have a set of Wharfdale Jade 3 W/ matching stands currently. I will likely place directly in front of these woofers on either side.
I have a 2860 cu/ft L- shaped room with extra wide doorframes (w/o doors) that lead into other large rooms.
28.5"x24.5" floorspace on the left, and need room for the air return here.

My biggest questions being. Is 2x 18" drivers too much, not enough? How much room should I leave for the air return to get proper circulation? What is a recommended amp for these? I'll likely have to hire someone to build enclosures for me. Anything specific I should look for in a good box builder? Any special plans I should give them for these things?
So, I am doing some work in the main room. Conduit behind the walls, for future runs, with new electrical with proper grounds.
I want to place an 18" woofer on either side here. I have a set of Wharfdale Jade 3 W/ matching stands currently. I will likely place directly in front of these woofers on either side.
I have a 2860 cu/ft L- shaped room with extra wide doorframes (w/o doors) that lead into other large rooms.
28.5"x24.5" floorspace on the left, and need room for the air return here.
My biggest questions being. Is 2x 18" drivers too much, not enough? How much room should I leave for the air return to get proper circulation? What is a recommended amp for these? I'll likely have to hire someone to build enclosures for me. Anything specific I should look for in a good box builder? Any special plans I should give them for these things?