I am a land lord with a couple rentals. I had to learn the law out of necessity.
1) The landlord can and will have the right to inspect the entire premises with sufficient notice as put forth by your rental contract. Just about every rental agreement has this clause.
2) The appraiser has to measure all the rooms in the house - they cant simply just go by a floor plan, or they would have already done that since each home is described in great detail at the County Recorders office.
3) The laws regarding the cultivation of MJ in a rental property is still in hot debate. Essentially, the landlord can state that growing MJ inside your home is not acceptable use of the premises and places it, and its inhabitants, in unsafe living conditions (fires, etc.). He can demand that you correct the unsafe conditions, and if you dont, he will evict you. If you comply with the demand notice and/or move out, you wont have an eviction on your record.
At the very least, he can call the police and complain and they will come and confiscate everything as evidence and you can play hell trying to get it back when you prove you are legit - of course when you get it back, it will be dead and unusable. You are better off not fighting that losing battle in my opinion.
Soo... what you do it this. Get a storage shed or use somebody's home that you can store it for the day, and move it covertly. Move it back when you are done. I know its not ideal, but hey, you took a risk and the alternative is that you toss it all out.