The glove box is great, unless you keep your stereo in it, the wire rack thingies are great, but having had one, you do find that stuff slides out of the gaps and the drinks holder just isn't big enough..
And I just don't have a 3D printer or a Laser Cutter or anything high tech. I have my imagination and a Bandsaw.
Step 1: DRAWINGS:
Drinks, phone, sunglasses, show tickets, change, chewing gum, sweets, bits and bobs.
The storage box is the picture on the left, the other one is an idea to fit in the ashtray compartment.