exhaust routing muffler placement advice?

[bigmoe]

Mocking up the dual exhaust on my 65. Suspension is a 3/4 drop. I have shorty headers and so far I've run the exhaust straight back through the trans crossmember to just behind the cab. Not using an h pipe. As you can see I've got a muffler propped up where I figure it should go. Right now its sitting 2 1/2" below the bottom of the wood floor. It'll be a challenge to jog the pipe in and up to the muffler inlet. Once I get the mufflers on and the truck is driveable I'll trailer it to the muffler shop to make some tail pipes to exit behind the wheels. I have no idea for hangers. How does this muffler placement look? Where/how should I do hangers?