It took me less than an hour to finish up the ship configuration door. Most of the code was already there from when I built the door a year ago, and all that was left to do was just wire it up with the UI controls. Now you can buy and sell all of the parts to improve your ship. The only thing left to do here really is the repair feature which I do not plan to touch until much later – after aliens can actually do any damage your ship.
Here is a little screenshot of the updated ship configuration door. Note the graphics for the laser and missile turrets as well as the shield.