BC, Orrie...Thanks!
Little here, little there...keep chipping away at it!
Found a simple battery box at a local circle track shop...easier than making one
Cut apart and rewelded the header reducers and a 3 1/2" 90 to turn the exhaust parallel to the frame. With everything we'll have going on behind the cab, I may just drop some Flowmasters on and dump to the side behind the cab.