I am framing a free standing wall of my new shower. I am pressed for space. I am using Kerdi for my waterproofing on the wall and floor. My question is. My wall will be 8' tall and 5' long with a 1' corner at the end of the wall. Can I rip the 2 x 4 down to 2.5" then add the 1/2" sheetrock on each wall? I plan on blocking between studs every 2' for support.