I looked into supercharging about a year ago. You'll need an Eaton M62 off a Merc (scrapyard or
eBay).
Easiest place to take the drive is from the aux belt where the aircon comprressor usually is i.e. if you have aircon, remove it and take the drive from there, if you don't have aircon then need a longer aux belt and pulley.
The throttle body would have to go at the supercharger intake, and the supercharger outlet would have to go via an intercooler.
All of the above would be fairly cheap and easy for any DIY person, but then you come to the problem of getting the ECU remapped. There are places mentioned in the forum for getting ECU remapped, several people have had a remap with the car in standard N/A.
So all you'd need is ....
Eaton M62 (or similar spec)
Intercooler
Piping
ECU remap
Much easier than a turbo, and set at slight boost would probably give a lovely increase in torque.
EDIT: if you're thinking of using a cheap piggy back ECU such as Dastek, forget it, it would be a wiring nightmare. You'd be better off getting a
Hondada kit but the right one for the engine could cost a lot of money
.