Unfortunately there are two issues:
1 - the cover for the Itsy Bitsy is not included in the models.
2 - the 3.7V 400mAh battery continues to be out of stock as it was when this project was first posted here. Temporarily using a 500mAh battery until the smaller battery comes back in stock.
Black flexible TPU used for arm grips.
The design uses three wire cable however the suggested cable is a four wire cable. And the individual wires are TINY. So tiny that no wire stripper I have would work - but luckily, due to its tininess, can be stripped with fingernails. Just an FYI for others that attempt this project.