Thanks John,
you were up early this morning. :D
Well..because I was un-sure what the door would look like. I have build and fixed the longest part of the wall(to the left of the door) but I left the smaller section (right side) un-attached. built but not dyna bolted. So the gap can be as tight or lose as I want. +/- 20mm or so. you can see it lying down in this pic. But, I'm assuming your answer is no 203, just a tight fit then, caulk caulk caulk?I would hope you have measured your space correctly so shouldn't have to fill to much. Just make sure the drywall seals right up to the door frame and seals all the way around.