A good question.
Im in a similar position with a WB wellbody. Good driveline and suspension. Easiest thing is to just rip the body off i think.

Its hard going here in WA though. Body swap falls into modified car cat and needs a engineers report etc.

I just found out (from the authority) that a WB body on a HQ chassis would be deemed an HQ and be treated as such in regard to saftey and emissions etc. Something to think about