Draft for the spec set is on https://github.com/limina1/indextr-principles. I'm thinking there should be a few types of index cards, but the main one (the Zettle-wiki) is the fundamental type. The first 7 are the easiest and most straight forward to implement.
I think getting an example network of what it could potentially could look like can drive a lot of attention to the project as well. Working on that, but def need some help to pick up the pace