One reason you need either a Freak or similar kit or to at least keep parts of the original airbox is that the airbox in installed through a rather large hole in the rear fender (mudguard). The right sidecover is attached to the airbox as is the starter solenoid. So, you could simply make a support to keep the carburettors from sagging, but you also need to plug the hole in the fender and find a place for the solenoid. The bike will look a little odd if you don't remount the side cover or replace it with something that looks like a vintage oil tank. Hmmm... an auxiliary fuel tank might be a good thing in that spot, you could probably get another 3/4 gallon there.
