The £1600 quoted by oddkiddcreations covers.

S1 rebuilt rollbar setup
Rose jointed Solid tie bars
Solid tie bar clamps
A rebuilt RS2k MTX75 box with upgrades if wanted.
1x Engine mount lowering the engine
2x Gearbox mounts with or without Vibretechnic mounts
2x Custom shafts
2x Inner CV Joints
2x Outer CV Joints
Gear linkage Quick shift style
AP custom made Clutch
Mods to the chassis i.e Welding painting etc.
Fitting!