Any chance we could get the K8115 firmware as a download or even as code for tinkering?
Yes I know there is no serial interface on the board for serial flashing (maybe a nice thing to add?) but you could easily take the controller chip and plug it temporarily on an Arduino Uno board for the purpose of flashing.
Also surprised give that you also have 3D printers in the catalogue that you don’t have a series of STL files with cases for your kits yet.