This is absolutely amazing, what I've dreamed about for years. I've always wanted my models to have a more narrow scale tread, so much so that even as a kid I did loads of research pre-internet, best I could in hobbyshops, stores etc to find narrow track wheels to make my cars more realistic. I understand the need for the wider track wheels found on all modern RC cars, I just would love to drive them with a more scale appearance. The crawler boom has so many options, why not touring and rally cars?
As I'm back in the hobby now I've been trying to collect a database of alternative wheels and tyres for my projects, there's so many tyres out for 1/18 and 1/16 models that could work.
I started building an Alpine years ago, but gave up due to being unsatisfied with the wheel options If there's a chance you could 3D print rally wheels and tyres like below, then I'd buy a set straight away! I've always wanted to build a RWD M-chassis version with mudflaps and a larger ground clearance, full interior etc.
There are some 1/18 Crawler tyres on eBay that work really well, they need to be narrower but its a start. I'll try and find the link.