I have actually seen it rolling on the roads in RWP and ISB.
Always wanted to get my hands on this one back in 1992, but at that time it had a coater B series engine and a was parked in front of community center. shadi hall near Holy Family. I still remember the showroom owner had plans of importing a V8 and other parts and restoring it, as it was in pretty bad condition even then, and with time it has gotten worse, Owner was asking 145K in year 92~93.
Personally I would go with most of the Guys on this thread that its not worth investing 700K on just the basic frame, after all it is not a collectors item, and as per your plans putting in parts from other makes will not do justice to your spending and restoration in its true spirit.