I agree, but some the parts could get fairly expensive. There is a fair amount of grunt labor in doing it with a lot of cutting and grinding involved
Depends on what kind of tooling you have to do a lot of the work. A tank and seat would need to be highly modified. The rest of it can be done fairly easily.
I would like to change the wheels to 18" and 21". I could have Buchanan's cut spokes and I could do the lacing, for instance. Or I could buy the spoke rollers and do it all myself. So you makes your choice and pays your money!
Bare