eGrace Nova Motors Battery cover

The original cover is convex and uses a lot of the space under the seat.
The new version is not only flat, but also provides a box.

This is kinda WIP, because I ponder to add some small things that will fit my needs, such as a cover plate, several boxes, etc. Feel free to do a request and I will add it.

There are two version, one plain box version, the other is for my 12V breakout with 6mm switch.