Hello,

I am working on developing an addon for Immersive 1.16.5. Is there a guide anywhere for doing this? I am specifically looking at adding a large multiblock... or 12

No, there is no guide. You'll need to just look at the API, read the code and figure it out.

I would recommend that you have some experience in modding first before you tackle multblocks, because they are quite a bit more advanced than normal blocks, items and recipes.

Okay thanks