Also, one crit I would say for your newest screenshot is that I'm not sure what purpose the U-shaped designs on the front of the panels serve. In the concept they look like they're supposed to be hatches or doors, in which case I would definitely add a top border to them and maybe some hinges or something so that they look…
Finally finished, here are some final shots, :) I found this piece of concept art that I have started to create in 3D and thought I would share my progress with you lovely lot. Also I think this way I will have more incentive to work on it in my spare time. Im not sure sure who created the concept but it can be found here…