Looking for GPT Advise for a work task

I have successfully managed to train both CoPilot and ChatGPT to carry out a fairly repetative task I have at work. This involves going through pages of timber cutting details and combining in efficient ways to create the least amount of waste with the timbers that we stock. The output would be a PDF (or similar) report that can be printed out.

I can see that if I put more time into fine tuning the way it works, it would only further improve.

Before I go down that path, I'd be much more comfortable hosting my own version so these resources aren't either taken away without notice, or put behind a hefty paywall.

Are there any good self-hosted solutions (ideally something that runs dockerised or within a Proxmox container) that would be good at carrying out this sort of task?