Thank you for your review! DreamLine does recommend that installation be performed by a professional, along with the help of a second person, due to the size, weight and fragile nature of the product. The QuatraLux is one of our enclosures that has no ability to be adjusted for out of plumb conditions, such as yours. For you to have a gap along the wall side going from 0 to .5" indicates that the wall is out of plumb and this enclosure may not have been the best choice for you. We appreciate the fact that you were able to make the enclosure work for you, but advise you to please check your caulk periodically along this panel to make sure you have a good seal. Thank you for your purchase and your review.