SD,

Looks like you have a real challange on your hands. Good luck on your rebuild. I look forward to seeing the results!
The Js and later do allow more cooling for RC engines, but I've always liked the lines of the earlier versions of the P-38.
When I finally get to it, maybe I'll do an earlier version and use a pair of SP-60s turning scale props. Now if only RCV made a contra-rotating engine...

Scott