@JoseMoreno
Thanks for the feedback! I totally agreed with everything, and the whole PNG thing was just me noting on how I remembered that Pencil (I think used to, not sure if it does anymore) stored each frame as a PNG somewhere, and I would basically tell the software to copy a portion from that PNG and save it somewhere else, although there are probably more efficient methods out there.
Also, I really like how you mentioned a template file of sorts; that sounds like a really neat feature! But should we keep it in a separate PCLX file? That may result in users switching back and forth between the files in different windows, which can get annoying. Maybe if Pencil had a “tabbed” layout where you can have two documents open at the same time inside of the same window, but the active tab is the one you are currently working on? (Think: how tabs in a web browser work). Either way, I need to upgrade my hardware before I start to develop, but when that happens, I’ll be sure to ask LOTS of questions for other devs 
In the meantime, my focus is more on getting a clear idea before working