The Aixam unit would probably suit a larger frame/engine. I know it works as I ran it up without drive to the rear wheel and it moved as it should.
What about an inline car engine with sideways cvt and shaft drive??? Just a thought
The front pulley comes with the original taper/ engine adapter but I don't know which engine it came from ,it is definately Kubota or Lombardini.
The rear pulley is standard 3/4" shaft with 3/16" key.
You need about 250mm between pulley centres.
These units are quite expensive(even s/hand)
email direct gilbatburton@ntlworld.com