I have spent the last couple of evenings trying to line up the two halves. This process involves me placing the halves together, marking the high/low points and then grinding them away. This is then repeated as necessary. My grinder marks are then made less obvious by using the air powered die grinder.
This is my 'To Do List', this is all I can think of at the moment but I'm sure more things will come to light, all I need to do now is start ticking them off.