Welcome to the Forums Nathan! Glad to have you.
What do plan on doing with the machine? A 2007 with 5500 hours is going to be tough recoup the money spent to repaint with today's cost.
Seat's are not that complicated, a local upholstery shop can do that including the foam just need to provide them the metal pan of the seat.
Sheet metal outside of a junk yard will be very expensive and finding "unbent" panels in a junkyard on a 14 year old machine is a needle in a hay stack. Might want to find a local sheet metal/fab shop that can make some new panels.
As far as the paint goes rattle cans work for us however we bring our machines in at least once a year to beat out dents, weld, bondo and touch up paint in order to keep them presentable. Rattle canning an entire machine is not something I would suggest.