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No you are not being thick..... I just make mine, with a plywood former, sloped for my taste and cover it with a suitable backer board, and drain kit, tank, and then tile over.When you said make your own I thought you meant you literally made the former. Am I being thick?!
Reply to the thread, titled "Options for second attempt.." which is posted in Tanking and Wetrooms on Tilers Forums.