Custom model problems

I am having two problems with custom models in my resource pack. I am not sure, but I think that they are related. I have looked everywhere and found this and this.

you cannot give a solid block a model like that

Is there any way of fixing it? Here is a screenshot with both problems:

Solution 1:

As the post you linked specifies, due to how Minecraft renders textures, blocks which should be solid will remove textures connecting to other solid blocks. It's why the post has a screenshot showing why a slab works, but not solid dirt.

Your best bet would be to, maybe, create a texture for the bottom, or simply not use that model.