Hi Markus, I can assist with building the renderer, done that a few times now :-) , time allowing. How fast this can progress crucially depends on how much input you can provide, like
- what elements need to be covered
- with what drawing style, color, etc. (can you provide license-free icons?)
- rendering behavior: what needs to appear from what zoom level on upward.
If you can provide stuff like this, I could probably have a first shot in a few days, and I can get you started for fine-tuning yourself.
Best,
Hardy