Remove the roof by pushing sideways at two points 80mm from each end on one side then the other to release the lugs inside, then by pulling in the middle of the roof sharply to release the ends.
Prise aside the lugs holding the top of the glazing unit and use slips of paper to stop them relocating.
Lift the interior unit and glazing unit clear.
Remove the metal weight if it is loose.
While applying a gentle downwards force on the chassis, carefully prise the locating loops on the chassis away from the lugs on the body, just enough to release them.
When all four side lugs on the chassis are free, pull the chassis down sharply to free the ends.