Walls – Can floor tiles be installed on walls

Conventional stick framing in North America has you build the floor first, then build a wood wall on that platform. If your pretend world doesn't have lumber mills, then google yurt.

The usual approach is to cut them so that the offcuts are not so small - and NOT to try to keep an "uncut edge" anywhere.

So, you'd basically plan to burn 48" of tile on each wall, though you should be able to re-use some of the offcuts around the corner. No getting around the 1.75" ones on the back wall unless you want to get cute and put a 3.5" slice in the middle of two 8x16's to make the width. Whether that looks good to you or not is your call - if it does, consider the same approach on the side walls. Something like:

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and then on the longer sidewalls:

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Look OK is, of course, a highly variable and personal criteria. In your shoes I'd probably find that I could live with another wall tile, but I'm not you and you're not me.