Looks as if calcium is locked out and possibly p.I would repot in a good nursery mix and at least min 30% perlite,water with a b1 supplement like superthrive,water until you get water out the bottom and hope for the best.
These things are already set up with bulkhead fittings,most I've seen are 3/4 inch. If you set it up high enough,no need for a pump. Can be gravity fed.Just be carefull if you get one used as people use them to make biodiesil,around here anyhow.
If you run 4000 watts you will need at a very min 2 20mp dedicated circuits.I would run 2/220s and split them into 4-15 amp circuits myself. Power consumption is no big deal.
The best way to send is overnight.I have friends that get packages 2-3 times a week. They have been doing it for at least 5 years. They just alternate between several addresses. They claim overight doesn't get inspected.
If you only have 1 tent in the room and are using a cooltube and 440 cfm fan you shouldn't need cool air from outside. Also a 1000 watt bulb and ballast puts out almost as much heat as a 1000 heater. Venting it in another room will cut your heating cost a little and add humidity of it is too...
You can buy 500 gallon water reservoirs left and right online. you would just need a trailer or truck that can handle 5ooo lbs. They run around 350 here.
It won't crack it but it will decrease it's performance. HPS bulbs need to get warm enough to work proper. That's what I was told,not sure if it's true.
I got a bubblegum kush in a 4x4 ft. about the same size in a 72 inch high tent,doesn't want to stop stretching,smells amazing.I have my light up to the ceiling tieing branches down. May have to snap a few tops but eh what the hell.