Reason, Cost , the cost to design the top end, then the mold cost, think there is just too much out of pocket cost, say easy to spend 15k to just get started, then ask the questions, how many would iI be able to sell? Will the cost be too high for the average wallet? I am guessing easy $1250 $1500 for 320- 330 kit, then cost of machining, and having rods made for the kit, then the testing of the top end to see how it works, then the cost of fixing any defects, you guys complain on the cost of a LT500 pipe, think your money ahead to stick a lt500 engine in a 250 frame or 450 frame, than trying to rebuild the wheel.
Still think if one of you guys got it together on the 450 frame hybrids you see more jump ship in that direction, newer geometry, more plastic choices, many a arms and shock components available, plus it would be light weight bas azz toy.