For whatever reasons the custom head accessory isn't model specific. I have it on for 5 but off for the other 4 saved models, but for some reason I can have it on all of them or none of them and saving doesn't effect whether it's there or not.
Secondly for some reason when I have it set for the model to have 2 tails one of them doesn't spawn in sometimes when I switch to that model. It's gone one moment, there the next after I toggle between models a few times.

I love the potential a program like this has and wish it great success in the future.

Yeah, the custom head accessory isn't part of the save system. It's kind of just a tacked on extra thing right now. Custom stuff will be getting a full revamp in the next month or so.

As for the tails, I can't seem to recreate that issue, but the save system was a little bit broken in terms of colors in v0.1.7 so maybe there is something going on there for the tails as well. I have since rewritten a lot of the save/load code so maybe (hopefully) it was fixed between then and my current working version of v0.1.8

Thank you!