And what are the full dimensions of your electric skateboard enclosures? It only says the length (20cm to 70cm), but I don't see anything else about width or depth, unless I missed it(which is possible).
in regard to the underboard battery enclosures, they are very much in development, although they are already proving to be very popular as they are very versatile, they can be cut to what ever length you want, the depth is approx 25mm & i agree with you it would be very useful of we could show some schematics regarding the dimensions of the battery box enclosures and fitting dimensions.
Its possible to cut slits into the under board battery box and bend it around the radius of the deck, the slits allow the flex in the deck to continue performing whilst so long as you take as long a battery enclosure and put as many batteries in there as possible will take you for a either a very very long way or a short distnace very very fast!! :-)