We needed to create a more exact design for our motor mount. We ended up taking foam display board a cutting out a shape that fit our cart more precisely. I then took that foam cutout and dimensioned it. I input the dimensions into Pro/E and ran a new FEA. Here is our new design.
We also chose to go with a 1/4 inch hot roll steel. This saves money because steel is cheaper than aluminum. We are also able to go thinner in material thickness without sacrificing any strength.