Rotrex A/S
It'll be a project for sure and it won't fit under the plastics.
You will need:
drive and mounting configuration
new airbox and plenum
intake route to the blower
intake route from blower to airbox
rods and pistons
.075 headgasket to bring CR down
lots of portwork on the head (concentrating on the exhaust side)
Those are just the top-of-my-head things you'll need.
Basically you'll need time and money and lots of both.