Yes. We hope, you do it. You can make your own original design from 3d-printed components. You can use our 3d models in STEP or FreeCAD formats as start point. It's for free.
No. Number of supported cells on the board is preconfigured and cannot be changed.
No. Our board is ready to use out of the box. Just connect buttons and other stuff.
Yes. We don't deliver any accumulators, because of posts restrictions. You have to buy it separately. Find compatible types of accumulator in instruction.
Yes. There is no restriction on a box material.