I'm a 16yo who loves all metalworking, be it fabricating, machining or casting. I have a humble shop in my parents shed, but I am extremely lucky to have access to a workshop at my school, which has milling machines and lathes. Building model engines is something which has recently fascinated me, as it seems like a challenge that would test all areas of my knowledge. The only thing is I can't seem to find a fairly simple engine design to start with, learn the basics and go from there. If any of you have suggestions that would be fantastic. Cheers.