Forget about what the A&P EAA guy told you (Its just as you said a fly in
the oiament) I did the same as you I got the first run KR-1 plans and
built the boat, spars and tail. i had and engine that had already flown
in a Jeanny Two and my flying buddys said I would kill myself n it
because of the pitch instability so i never finished it. Now about 6
months ago I read about Bill Reents KR-1 on KR-Net and about how much fun
he had for about 221 years abd have been kicking my butt ever since. I
wasted 21 years so go ahead use the VW or the corvair ethier have been
shown to work well AND GO DO YOU THING.
Jim