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I think it is awesome and well thought out. Many times we are looking for trends between different types of samples too and this would be perfect for that. That deflection is very little. And like you said it is $160! Bravo!
This is very impressive. I run two full sized tensile testers (made by Instron Corp) at work and have a lot of seat time on them. This is a very well thought out project and incredibly documented. Well done!!
My only concern would be flex in the fixture itself. It needs to have zero flex to get good/accurate results.
FULLY FUNCTIONAL Tensile Testing Machine: Tinkercad Contest Version
My first Mechanical Iris