Dear Dreamline, I purchased your Unidoor Plus 47"W x 30-3/8"D x 72"H Hinged Slower Enclosure and we are having much debate over the dimensions we need to use to build the shower curb so that the glass sits properly and in the middle of the curb. The curb will be built from 2 2x4's clad in durock and finished with marble threshold cut to size (once we figure out what that is!). Appropriate liner and waterproofing used. Would you please suggest some dimensions for me? The instruction manual has me confused! Thank you so much, I am really looking forward to my new shower!