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If you are reasonably handy, you can make an "odd size" shower base.
What I usually do is create a wood "form" the size and depth required, install the drain and trap, just below the level of the top of the form, and pour concrete. This concrete can then be contoured from the edges of the form to the drain - I usually rough it first with a trowel and then finish it using a metal can lid in circular motions.
Mosiac tiles, 1" x 1" square, or the smallest you can get can then be laid on the concrete.
Will the floor will take the weight of the concrete? Compare the new base to the the original bath tub - filled with water and I think the answer will be obvious!
The above has worked for me many times and the results have always been worth the effort.
Good luck, Alan.