1. You will need two or three sheets of 1/4 inch plywood, here it is C$50.00/sheet, hinges (four of them), a lock (optional, it is what I'm putting on mine.), and I'm not sure of the price of mylar.

A:Overall if you want to build a really good quality box you will need about C$170.00. That is only for the box.

2.Keep the floor space at two feet, that way yo ucan stack them one ontop of the other. Plus the extra space wont hurt at all.

3. No clue.

4. One plant, with two feet of room plus all the instruments you are going to have in there I suggest you go with one plant/box. So what you can do is veg one, when it is done vegging put it in the flowering box and then start another one in the vegging box. For this I would make a 3 foot veg box so the plant had lots of room to grow.

Hope I helped.