RE: fh buggy body
Hndaman1's solution is probably a lot better for airflow cooling under the body shell than my solution. I put in foam blocks about 4 inches by 4 inches. It took several blocks and compressing the body shell on top of it to keep the roof from being compressed. This much foam and pressing down on it would have the foam all over the top of the engine blocking cool air from flowing over the top of the engine.
It didn't seem to make much of a difference in cooling - I didn't have any known problems from it.