Ive seen a lot of see through things, but never an engine. Just an idea, but I know a lot of phones and tablets have Gorilla Glass screens. I know unless u were to take the tip of a knife and grind it you cant scratch it. Maybe its as heat resistant as it is scratch resistant. The area dosnt look too big, If you got a few bucks you might wanna try ordering replacement glass for a kindle fire and putting it on there. Also is that a see through pullstart? If your going for that theme a plexi glass carb would look cool, maybe the top of the throttle lever box, chain cover.
Rides
1986 Honda 250sx
1982 Kawasaki KLT 250
1983 Honda 110 (sold)
1995 King Quad 300 (traded)
1983 Honda 185s (sold)