Hi,
If you have used genuine parts for the 4x4 conversion there shouldn't be any issue. It will look stock so the inspectors won't know.
As for lifting, this is tricky here. 50mm is the limit but if there are no specs on the components they will ask for a 'low volume certificate' from a specialist certifier. Could be easier to drop to standard height.
DOn't worry about lighting etc so long as it is stock. Red indicators are allowed here as are amber park lights at the front. You will just need left hand dip headlights to be installed.
BUT, keep a very close watch on the govt website as there are changes afoot as to the import of vehicles under 40 years old.
Oliver