the only things i can suggest are disconnect ecu and remove (keep inside house) feed wiring from ecu thru firewall disconnect only tthe things necessary to lift body off motor the more items youleave on front cut the easy it will be later. if you have struts, brakes/discs,steering rack leave these on eng assembly if possible simply lift body off eng. do exactly the same to refit. brake pads and flexible brake hoses should be changed. there will be items then that arent the same to change from one body to another. this is just an idea i havent seen one of these before but this is how i attacked mine. only other thoughts are before fitting engine check for wiring differences in cab and change over youll need wiring diagrams