Welcome from me as well.
Enjoy your stay.
To the oil cooler design...the idea is workable since all the factors and technology already exists on many cars.
You may find some level of restriction on the air intake with the cooler in place.
Oil tends to heat up less slowly (although an early Subaru used it for cabin heat many , manyy years ago) than the exhaust system so you may want to consider using some form of exhaust heat collector (old air cooled VW's had the cabin heater taken from the exhaust) as has been suggested by RH 77,
Regardless I hope it works as well as you want if / when you decide to build it.
Cheers , Pete.
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