I'm looking to commission a 1.12.2 mod that's an addon for Recurrent Complex. Simply it's a block that allows you to input a specified range. And when the block is spawned inside a recurrent complex structure. It would prevent the placing and breaking of blocks within the range of the block. I've tried to just do this with command blocks. But I can't for the life of me get it to work. Commission price is negotiable.