DARN!!...I wanted to be the ONLY one with that bike
I think if you want to paint the bike, that is a personal choice up to you. But now is the time to do it before you mount the motor.
I paid $15.00 for mine brand new still in the box at a yard sale, I've been very happy with it. They run between $200-$300
You will have to have a frame adapter for the front mount...I drilled mine but I would not recommend that to any one. And it's a tight fit with carb at the seat tube but.
And the most important...if you plan to keep the fenders on you will need to modified the mount for them. The stock one will break in the first few rides and could be a big danger!
Here are some pics
I have more videos and pics....just search around