I am not sure if this is out of scope or not, but since this mod has resource pack support, I'd like to make my chests full block size and not have the lid open when you access the chest.

I tried to disable the lid somehow using the json model files, but I wasn't successful. Is there a way to do this, or could it be an option in the settings to disable the lid opening? Thanks!

Make the lid model have no model elements, it will be an empty model
Then make the other two models be full blocks

Make the lid model have no model elements, it will be an empty model

Thanks for the answer! For some reason, last time I tried this I recall it didn't work. But I just did it now again to confirm and you are right, I've solved it. Thank you!