Finished: https://drive.google.com/open?id=1E1DKTQW5MVszMOJXlpBJ0uKf-6lskWSQ

This figure is based off the original Yeti costumes used during The Abominable Snowmen. The Mk. II version seen in Web of Fear differed significantly, despite the episodes being filmed only a few months apart. The Mk. I Yeti looks much more like a living organic creature, and lack the weird "Mothra" eyes, squared off mouth, and bare "muscle" patches of the Mk. II's. They also have four fingers on each hand instead of three, and most unexpected of all, had somewhat creepy looking cats eyes that don't appear to have been visible at all in any of the surviving footage. (Though since we're lacking 5 of the 6 episodes, it's hard to know for sure.)

This figure also comes with optional accessories including the pyramid of control spheres from the cave featured in episode 2 and a removable control sphere that can be sat on top of the pyramid or inserted into the chest flap.

The zip file contains separate folders for PLA (filament) and SLA (resin) versions. The SLA version has an extra point of articulation in the form of rotating ankles.

This figure requires at least one 1.5mm wide brass rod to be trimmed to length for the elbow pivots and chest flap (on the SLA version). These craft rods can be found online or in most craft stores that have a model airplane section. Alternatively you can use a thin wire coat hanger, sturdy piece of craft wire, or even a toothpick but you may need to widen some holes prior to final curing with a small hand drill.

Before painting, it is recommended that you fit all parts loosely together without glue to make sure that they fit and move freely. You may need to sand down some parts or drill out some holes if they are too tight or don't fit together smoothly.

While this classic Troughton story is entirely missing aside from episode 2, we are quite lucky to have lots of excellent behind the scenes color photography and 8mm footage to consult, so we know exactly what the original Yeti looked like. The fur is a lighter brown on top, with a "dirty" grey tinted mid section, and the "face" and area around the chest flap are printed black. The hands and feet are black with white claws, and the chest cavity and control sphere are polished silver.

Useless information you don't really need to know: The oddest revelation about the original Yeti came as a surprise while I was pulling together source materials for my figure design. While not visible in the color photographs taken during filming (which have made it into several books and magazines since), watching the somewhat grainy 8mm footage, I was surprised to discover that the Yeti have eyes, and not the weird bicycle reflector "moth" eyes of the Mk. II. These appear to be yellow with almost cat-like pupils! Why we don't see them in the surviving telesnaps and Episode 2 footage is something of a mystery, but I suspect there might be a couple of explanations...

First, it's entirely possible this fellow above was a "hero" costume, which means it was given slightly more detail than some of the other background Yeti, and may have been used for a purported sequence in one of the later episodes where the yeti's eyes are supposed to light up. I've talked to at least one fan who claims to have seen this in the original camera script, though whether it actually made it onto film (or was even visible in the televised episode) we may never know. It also appears that the Yeti like to cover up their cats eyes with long fake eyelashes that appear to have been glued on as an afterthought, if this footage from the Schoolboys And Girls Exhibition (1967-1968) is any example.
And if the cats eyes weren't weird enough, it appears that they had a beak-like nose, which can't really be seen unless you get the perfect camera angle, like the one below.

Why am I telling you all this? I actually tried incorporating these elements into my original Yeti sculpt, but it came out looking more like a Gary Gygax owlbear than the Yeti we all know and love. A Yeti with a visible face... just doesn't seem right. So the figure I'm releasing is a compromise. It still has a bit of a beak, but not as sharp and hawk-like as the photo above, and I replaced the cats eyes with the lashes seen in the youtube video, but with a little bit of an indentation to imply that there are eyes under all that fur.
However, if you want to customize yours to match what we now know an accurate Yeti looks like, be my guest.