I am planning an in-ground vinyl liner pool build. It will be a concrete wall pool. I do not like vinyl on steps or plastic steps. I am planning to form up concrete outside steps and plaster them to waterproof. I would like to run the liner track in a "U" shape around the steps just like the kits. I plan on attaching TREX to the form walls on the inside to attach the liner gasket kit to. The only problem is I cannot find a supplier that has it. My question is is this a good/bad plan and can concrete steps be put in a vinyl liner pool this way? I am also planning to do a swim up bar and have the same issue as the steps.