On one I have one cable-tie each side around the forkleg with a rubber block between the plate and the fork, the second one I drilled & tapped a hole in the centre of the top & bottom triple-clamp and use screws. Not sure what I'll do with No 3.
You know, I'm planning on coming over to the US for a holiday, and was thinking of riding in some vmx events, I should buy yours, get you to prepare it ready for me to ride (seeing as you are already doing the work to it ;-) ) and then I could crate it up to send back when I've finished with it? Hmmmm...........