good -
wire looms WAY to close to exhaust, and maybe not, but I would imagine, visible from behind?
Tuck 'em away.
Use the space under the box. Maybe make a platform that give one of the amps enough clearance under the box? (so the box is sitting on a "table") Just enough for clearance tho. Then you can mount the other amp on the back of the box?
I like the tops on the battery idea - just give it clearance so the posts aren't rubbing.
VERY nice install. Simple and effective. I like your carpeting technique, and I like the carpeted bat boxes, Its rare to see someone carpet and fully finish a box these days? (maybe its just me, but I haven't seen a carpeted box on her in ages)
cudos