things to look into:
manual gearbox & flywheel & clutch compatability,
driveshaft spline size between gearbox & hub,
clutch cable & support bracket,
clutch cable bulkhead mount & clutch pedal assembly,
rear engine mount,
gear selector linkage & support beam,
gear stick surrounding trim,
gearbox oil,
on a manual gearbox chassis, after cutting the hole for the clutch pedal, you'll also need a 10-15mm spacer (made mine from cutting an old gear linkage bush in 1/2) so the clutch pedal assembly sits correctly or else the pedal will travel too far down and hit the floor.
http://micra.org.uk/threads/pollymobiles-rebuild.35251/#post-381115
also the CVT control unit under the engine ECU controls the reverse lights. with the auto box gone, you might lose the reverse light function unless you rewire it.