I have not been able to find a shower basin (32x74 1/2) this size. So my question is do they make them or do I have to make one. I have never made one and would need step by step help. Any help would be great.
Thanks

They do make shower bases to replace a bathtub. 31 X 60 but if you want to install a 34 X 72 shower you will have to install a custom tile shower. You will first have to install a flange type shower drain,(see image). Next, here are the instructions that you requested. Click on: How to Build a Shower Pan to see. More questions? I'm as close as a click. Good luck, Tom