Sorry Sundance, you do not get a free pass on your spa, there are a few things I would do differently.
1. You need to have power connections on all four sides. Just because you have a hole in the side does not mean that is the best place for it in my own individual installation. I put my conduit enterance in a different place.
2. The display is a Liquid Crystal, it should be Light Emitting Diode with a viewing angle for both inside the tub and outside the tub. It is nearly impossible to see it while inside the tub.
3. There should be more hand-holds on the inside. Traction to move around is not too good while floating in the wrong position.