Open Source Resources for Kigurumi Masks
If you are still determined to DIY your own kigurumi mask, there are a number of open source resources that can help you.
3D Models
There exist a few open source 3d models that can be used for DIY kigurumi masks, one of the better, more customizable ones is plumKigurumi, do note that this requires a good understanding of blender and the various tools and features it offers.
Have more resources? Please contribute!
Please contribute to the wiki if you have an example of a 3d model you think is particularly well done.