Easy Order Purchase App

Requesting a way to integrate the PDF invoice generator to our Draft Order admin page so that we can generate invoices for New Draft Orders we create or when we need to revise a Draft Order for a customer.  

Would also be nice to have ability for our customers to be able to generate invoices based on past orders. 

I finally got my PDF template perfect -- but it's still not pulling some of the customer info -- so those variables may not be correct.  Thank you!