About this 3D model

This is the first version of LimeBox, an Olinuxino Lime Case. The Olinuxino Lime is an Open Hardware by Olimex that sports an A10 Cortex-A8 CPU 1GHz with Mali 400 GPU, 512MB of RAM, a bunch of hightly desirable interfaces, and it runs Linux. For more information, look here https://www.olimex.com/wiki/A10-OLinuXino-LIME This case design is very simple, still needs tweaking, and also a cover. In the spirit of open thingi-ware, it was designed with Freecad and the source is attached to this thing. To help with the design, I first made a PCB outline (also in Freecad - files attached), and used it to come up with the case. Please show me how bad I'm at designing things by modifying it and making it better. :)