Till one of the other guys gets to your Q's I'll toss this out fwiw.
1.) I do believe if you remove the wheel well liners you can do the exhaust bolts.
2.) Same as above and the "K" members, two of them at the front of the oil pan can come out I think 16mm wrench &/or sockets. The one on the pass side will reveal the wiring once it's out. The pieces I'm talking about appear to be holding the motor mounts, they don't as the motor mount is actually on an ear on the main frame rail. Just remove the two front 16mm & the rear two 16mm(?) and that bar will come out.
3.) This one I can't answer
, but Jeff or one of the FBI can answer that one.
Tom