Yes, that’s what I meant by not perfect :-). This was a quick and dirty edit. I did not spend a lot of time on tweaking the masks and added a quite liberal blur and feathering. Probably fixable with a lot tweaking of the masks. I also did not spend any time on noise. But the point here is that this is an HDR where you either fix the grey point of the interior or of the exterior, or both using some kind of masking. Using flimic for the whole scene will result in either a completely blown out exterior or a very dark interior.