Can I make giant blocks? and is there a way to make bounding boxes clear freezing in the box?

Hi, so like I'm basically trying to make a block that's like 30 blocks high and ten blocks wide, I have the model and texture exported out of blockbench but putting it in the mod made it like 2 blocks high and I can't find a way to change the block size. So, I wanna know if it's even possible and if it is how I can do it.

About the Bounding box dilemma, basically the mod is that if you are out of the blocks bounding box you get the freezing effect but well I also have no clue how to get a bounding box set up or if its even possible so help would be grateful.

Please help I'm lowkey on crunch time.