Thanks chriss, hopfully it will be do-able to put a hole through the wing!
Looking at pictures of the concept and what mine is hopfully going to look like when finished and im really put off by the Z3's quater side window! looks old and dated. with you doing this to the SWB...
Is there any way that i could get rid of the quater qindow and have a new '1 piece' bit of glass cut and put in? is there enough clearance in the door to be able to do this and still use the electric windows to put the window all the way down?