Some one will help you there.
If you want to keep the electric starter, there maybe part available on the internet.
Found this information in the local Minneapolis Star Tribune April 5, 2020 edition.
This outfit in Bemidji, MN claims to have original drawings of the P51. I know nothing about them and I am not associated with them. Just passing this information along for anyone who might me interested.
I have shipped several 500CC Rotax engines. Make a sturdy 2X4 frame that is about 2" wider that the engine on all sides. I used 2x2 lumber for four vertical post and then joined the four of them above the engine with more 2x2's to complete a frame.
Make sure you add two 2x4's in the middle of...