Pete, I was totally right
You're having the same problem I am: You severly want to build an engine, but have nowhere to start. This has gotten me so stressed out I've put my fist through walls thinking about it.
And good idea with the bike, I was just talking to gearhead the other day about turboing a CBR600. I have full access to a fully loaded machine shop and racers/engine builders so I wouldn't too badly off, but it still would probably be very far beyond me. Man, lol, I've entertained so many ideas. My current one is dropping a VR6 motor in a small 13" jet boat. Or one of them 18 footers that has a 350 in it. lol..anyway...Just trying to say I feel your pain I guess.
No worries, the right project will come along, but I don't think this is it.
Good luck,
Slow