Original

Box to hold a Raspberry Pi or two (or perhaps an arduino stack) and another unit below such as a battery.

There are no connections through the sides of the box, all cables come out at one end.

The box has a ridge to support a shelf with a gap for leads.

The extension piece can be used to make the box taller and support another shelf.

Update

I have added a deeper base main box and a deeper extension to allow a little more room.

There is also an alternative lid with extra slots.

The servo pan-tilt mechanism was bought!

1. Print the three main components:- Lid, Box and Shelf
2. The shelf is shorter than the box to give flexibility and to allow for cables to pass between the upper and lower compartments.
3. There is a fourth optional extension piece to make the box taller and optionally support another shelf.
4. I recommend fixing the extension in place with a little super glue along the join.
5. You may need to source a Left Angle Micro USB connector for the power plug in order to comfortably fit a Raspberry Pi A+ or B+ board in the box.
6. I have added a deeper base main box to allow more room below the optional shelf.
7. I have also added a deeper extension to give more room above the optional shelf.