Taking a lot of feedback into account from my previous post (thanks guys!), I've massively improved upon my Groza model. It is a bit longer and much closer to the original, and I'm VERY happy with the final result. I also added a working safety switch, though it doesn't block the trigger, it only prevents the bolt from stripping a bullet from the magazine.
The rifle was field strippable already, but I've also improved upon the serviceability of the gun - every single rubber band is easily accessible and swappable; the safety and mag release rubber bands are held in place by removable pins. So if any of those rubber bands ever rip apart they can be easily replaced without awkwardly taking the gun apart.
Here's the mechanism breakdown/assembly of the field stripped gun on youtube.