Snap Walls- Building upwards and onwards

Seeing the Snaps walls that were in the winners pool for a contest i noted the creator listed some possible improvements, Mainly vertical stacking and floors. While i've modified (In tinkercad, accuracy is ,,, suspect) the walls i've yet to get a good floor design however i hope that the original creator can incorporate these into the final design. Rail attachments - A top rail and subsequent slot have been added to the upper and lower surface, when stacking walls with more than one orientation these will provide a substantial purchase for light work and game play. Flooring - I've added a 0.35 slot hidden within the lower portion of the walls, this allows for a approx 0.3 thickness floor to be slide into the recess, in the case of laying out floors i suggest s similar connector to the walls, within the confines of 0.35mm to allow slot insertion and floor to floor connectivity. I would suggest printing in Resin, benefits to accuracy and rigidity would help a small item like this no end. This is by no means a finished project for myself and mainly upload this to help the original creator with some ideas.