Problem with custom block

I'm making a mod of Judaism, and I made a stander (that is complicated). I was need to make this block rotatable and it need a custom bounding boxes, but I don't have any knowledge in modding and the tutorials I did didn't work. I have a little big request, but please do it. Can someone edit a MCreator workspace I will send him, and make the standers (there are four kinds) rotatable and with custom bounding boxes?

I would really appreciate it.

Thanks!