I weigh about 200 lbs. 5′ 10′. Do you have four stokes on any of yours. The website says that the elite was built for clone and LO206, but I don’t see why a LO206 wouldn’t fit on a rapido.
I’ve had confirmation from Italian Motors that they recommend the Rapido V for 4-stroke applications. If you go to their website, they often have used 4-cycle packages advertised on the Rapido frames.
No need to do any cutting of anything (maybe if you have a mid-00’s Rapido, but not a 2013). Run a soft axle in the rear.