Excellent, glad your on track to getting your custom templates up and running 
Your correct, we don’t have a donate button, but we’re always on the lookout for extra hands, we need more docs on doing what you doing currently, Robin has already written some introductory docs here.
Pretty much anything goes, we need lots of docs written for our codex and anyone can create new and/or edit existing docs, so if you feel the urge to contribute that way if that’s your thing, that would be great. If not we’ll also be having some other initiatives in the new future.