Brett,
Do you have any information you could share regarding the Aerovee engine. From the fact you plan to build a Sonex, I expect it must have been at least reasonable.
I'm right at the start of my journey, taking lessons and working out what to build or buy. My inspiration came from visiting the Oshkosh Airventure this year. Seeing the 7 day wonder come together and later seeing the Sonex stand including the Aerovee and of course the Subsonex among other sights was quite a revelation. Until Oshkosh and the LSA aircraft exhibited, aviation for me was being carried as freight around the country and visiting avaition museums. Now I suppose the bug has bit.
Regards,
Mike.