I have a M1009 without engine transmission and xfer case. I also have a rusty 88 burb that runs fine (350, 700r4, np241), but is slated to be an organ donor. My thoughts are to move over the engine, transmission, transfer, vacuum booster/MC, under dash harness, engine compartment harness, ac evaporator/heater box, under dash hvac ducts, and instruments cluster and hvac controls and ducts. How do-able is this and what am I not thinking about or missing? Any help or comments are appreciated, except those that question my sanity. 
PS… I will need to cut the firewall, won’t I?

PS… I will need to cut the firewall, won’t I?