I really like what you have going on with this project. I too believe one facet of the future of the hobby is the mix of custom electronics with the tactile nature of the trains and layout. Something like this in kit form would be a fun project to involve older kids (teens) into the hobby while introducing them to electronic engineering and software coding.
Great price point - in line and lower price than similar products.
I apologize for my ignorance, but does the radio signal emit from the phone/device? or does the website communicate with a separate device to provide the signal?
I would like to hear more about the radio controlled switch modules.
I also like your idea of varying scenery using LED projectors. I've attempted something similar and really liked the effect in person: https://ogrforum.ogaugerr.com/...3#153322190445430903
Which brand / model of projector are you using?
I think it's efforts like yours that will push the hobby forward.