That would be a great idea except that the individuals or companies that have the capability to machine out the custom parts want lots of money. Lets take baby steps first and maybe start off with a Roid then a Liger. But even those are out of reach of most riders. There was a Roid on Ebay not too long ago that went for around $3500 (someone correct me on this). And on the old site, Hybrid Engineering mentioned that a complete running Liger was around $9,500-$10,000. You could count on probably doubling that figure for a twin zilla.
PS: Now if someone would work for beer, I got two 30pks in the fridge that I would donate to the cause.