I would love a CRM template.
I'm a total Honeycode n00b here so take my suggestions with a touch of salt.
You might be able to create a report or invoice by creating a new "screen" which then uses a filter to show just the data and calculations you want, arranged in a format you create.
Then to make a .pdf out of it you can do a print-to-pdf from your browser window.
Anyway, I hope that helps you on your way to a solution