[twr]

Hi the seats, door panels and dash parts can be changed over pretty easy, i have had most of those parts off my 2008 at one time or another. The only thing i did not take out is the back seat. The headliner is not to bad either, i changed mine because it had a rip from the other owner, A good mechanic could do it in 14 to 16 hours. As for the nav radio you need to remove the voice harness, gps antenna and the radio from the one truck then install both radios in both trucks then both will need to be reprogrammed at Gm. Its about $60 each truck and 2 to 3 hours labour for both. Hope this helps just pm me if i can help any more.