Looks like a good route. Your going to have to hire an instructor to go along for the ride. No club is going to let you go solo anywhere in the mountains, let alone go solo with such low twin time. As for the high altitude flying, everyone around here hates the idea of taking light twins into the mountains because of safety reasons, I've only flown SE in mountains. Jackson hole is very scenic. Mount Rushmore looks pathetic from a plane, I took a pic but you can hardly see what your looking at. I recommend you fly to Ledville or teluride on the way back, great scenery and from there you can hit the black canyon and then it s a straight shot from there to moab. You might be able to find a cheaper seminole in Denver not sure, try all the club's at centennial airport.