Not sure if you're still releasing updates/bug fixes for the Minecraft 1.12 version of this mod, and sorry if it isn't, but here's the issue.

It doesn't even get to the forge mod initialization screen so I had to look at the log file to find the issue. It occurs when only this and OpenModsLib is installed.

Here is that log file: latest.log

Interestingly, if I edit the file names so that 3d skin layers is loaded after OpenModsLib, the game will load and even lets me into the world. The only consequence that seems to come of it is if I then install the OpenBlocks mod and use the Hang Glider item, it doesn't pose the model so the player just stands upright through the center of the glider's model like so.

This hopefully means some sort of compatibility is possible that doesn't require janky methods of changing file names to manipulate the mod load order like I do. If not, at least I can use them together with my methods seemingly without any game breaking issues.

Don't think there is anything I can do about this. OpenMods seems to use CoreMods, which is the predecessor to Mixins. Changing the Mod name to trick forge into loading my mixins first is kind of a janky workaround that I can't really release for 1.12.