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williewillus is maintaining a primer on the 1.13 changes here: https://gist.github.com/williewillus/353c872bcf1a6ace9921189f6100d09a It'll be significant work for modders but I'd say considerably easier than 1.7 -> 1.8 was.

It looks like you never register ClientProxy with the Forge event bus, so the ClientProxy.registerModels method is never called and your models are never registered. Either register it manually or annotate the class with @Mod.EventBusSubscriber to automatically register it. Make sure you pass Side.CLIENT to the annotation so the class is only registered on the client, this prevents the dedicated server from loading the class and then crashing because it can't find the client-only classes referenced by it. Forge's documentation explains events in more detail here.