OK, 2nd reply, sorry.
I am a DIY guy myself (see webshots below). I spent 20 yrs in insurance claims, and I think if something failed in your conversion that hurt or killed someone (like a frame modification by a non-professional), you'd be paying for it the rest of your life. Even with my (IMHO) experience , I would not do the frame myself. Sub it to a shop & do the rest yourself. Then you have a legal course of action and peace of mind. Consider standing in front of 12 idiots & saying you did it yourself, 20 tons and 65 MPH.
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