Sorry guys only found out about this place this month
I am not familiar with your Orion bikes at all so please take what I am saying with a grain of salt. I just know from doing a pretty extensive conversion taking an SDG front end and entended swing arm and bolting it onto a BSF aluminum frame (which didn't really fit at first) and then going through the same issues with the wheels and tires after taking the thumpstar front and rear end and bolting it up to the SDG...... it was a pain in the ass needless to say but the way I addressed all the problems was just to bolt it up and see where the conflicts were and address them one at a time. Good luck with your conversion, I've never had to address an issue with an offset rotor so I cant really contribute anything there.