DAISO Display Base Depth Extension

Depth extensions for DAISO display base.
These depth are 50mm for 30MM AC VI Plastic Models.

Requirements:
- [DAISO Display base](https://jp.daisonet.com/products/4965534168670) x1

Printing:
- stage-50 x1
- stage-joint x3
- beam-50 x2

The number of items changes according to #connections.

If you stack the base vertical, I strongly recommend to fix the stages with glues.