converting auto mini into manual is not a difficult task....
you dont need any additional wiring or ecu.... rather your auto gear wiring and computer will be unmounted and retained as it is in vehicle for future re conversion.
auto gear will be replaced with a robust manual gear assy with 5 gear .. on same mountings.
if you want to buy new shaft its okay... you can also use your existing shaft (reduce length by cut weld)
hydraulic oil lines will be dismounted but will remain in place
you need to buy cluth plate, pressure plate, clutch cable and cluth cable holding mounting.
the only left part is fabrication of clutch pedal and clutch wire hole... i know a few guys at pindi expert in job... they will do it perfectly....
result: off road capability and power will increase, heating problems will eliminate , fuel economy willl increase and maintenance will be simpler and easier, due to 5th gear drive will be smoother