Joe you can always wrap the motor and electronics up in foil, pull the tins.... scuff the frame and shoot the frame with the motor in that sucker... i have done it in the past. just takes time to prep that sucker up... that is what we did on my brothers goldwing build, didn not pull the motor and it looks awesome!
makes the bike look like brand new, we used a gray scuff pad, wiped down with denatured alchole, and tacked cloth.... hit the whole frame. taped up parts we did not want hit, and went to town. took one night to prep, one night to shoot... night and day diff... it would realy make that motor pop and show all the work that went into it with a clean black frame...
pulling the wheels off these old scoots is a snap, hell if i was you i would just take off the front brake, and pull the whole front end off with the tubes. foil wrap your trees, pull off the rear wheel, foil up the chain... you already relocated your electronics so that is a simple cover, your new air box is simple to wrap, then just cover the motor in foil.... i get it from the dollar store. bet the whole deal would take you maybe a night to prep and another night to shoot. cost you 10 bucks tops! give it a whole new look and really make all the work you have done shine bud!