Am I reading the reg's correctly ??
I can use a 220 if I build an 18" deep conibear box slot?
or with a 6" opening limiter on a regular deep conibear box.

I'm not into bucket sets, as they are an eye sore on state land. But I do see bucket sets ok with a 1/2 lid.

I believe your correct but call your local ECON officer.

I'm not into calling econ. 1/2 of them are like building inspectors. They make up their own rules as they go along. I'd rather see it in writing and have a hard reference should there be a problem.