the tents are ok but you will be up and down all the time.
Cant do it if ya live with ur old pair.
if not i would say make the attic into a room
since no one will use it anyway and dont have to buy the tent then.
insulation in the floor boards and then in the roof rafters before plasterboard's go on and plaster and paint white room larger than tent.
you would have to insulate the attic anyway. as the heat change between night and day. and vent for it.
fresh air in and then filtered air out.
and cut down on the noise of the fans into the rooms below.
so ya can set up seed area, young plants, then those in bloom.
Ya can keep a rotation going, by keeping a mother plant and clone it no need to buy any more seeds. SAVE SAVE SAVE
i (would)use the eco lights and they are grand and the different light spectrum, for the different phase of growth.
and ya can set up a water barrel in the room for ya self.
can tap into the water tank up there and treat the water before use.

hope it helps
and once you do grow don't show off
when asked where ya got it? ANSWER= brought of a friend of a friend who knows a guy
ya know how people talk and some little rat hears and saves his own neck by landing you in it
but will save cash if heavy smoker
need to know any more drop me a line