Cup, you are correct. I believe everything is done internally. There a generators for backup, we have to be wired. There are security systems. Something has to power them. The floors must be in for sanitary reasons for the MMJ. If the floors are in then all rough plumbing is done. The walls must be closed in for sanitary reason, which means all rough plumbing and wiring are done. The inside must be complete to have completed HC's process.