Currently If I need to mark a cube area to copy or move later I need to use 8 chambers block with a chamber card. Can we make it only need 2 on the diagonal of the cube? or something similar to shape card (which only needs to click the 2 diagonal block). The cost of the chamber block can be higher than it is now to compensate the number, but result in way better experience.

Hmm not sure about this. I actually think it makes sense to have a full cube here

OK, then... Hopefully you will change your mind in the future. Anyways thanks for your awesome mods!

how about 4 blocks for 1 wide builds?