First model, what obvious mistakes am I making?

[djr]

Hi

This is my first attempt at a model. I'm trying to make a plate to clip to the back of an Amiga 1200 case, to which I can attach the various ports from a Raspberry Pi (the Pi itself would be elsewhere in the case, not directly attached to this plate).

I don't have a printer of my own and would be sending this off to a local service. Are there any glaring problems in the model? I've tried sticking to a minimum thickness of 2mm wherever possible.

Thanks for any feedback or advice.