Looking at your original questions:
1. Not honda practical but a lot more fun
2. The m20 is an old engine and not that fuel economic. I had a 325 some years ago and I think it was somewhere around 12l\100km... Memory isn't that flash though :-)
3. In a garage I'd expect it to start first time everytime. If you are going to leave the poor old thing on the road for days at a time without driving it then it might take a few cranks.
If you are mechanically minded or have a good relationship with your euro mechanic then go have a look. It's looks to me like a reshell - probably due to crash damage or rust. If done well then good fun. Check Thoroughly!