Hate ta burst yer bubble, guy, but ya won't make it.
First of all, the A/C just won't handle it. Ya need FRESH air and a lot of air flow.
Remember, the rule of thumb is 1/2gram per Watt. Best case scenario is 500 grams in 4 months. Thats best case. Upstairs in a T/H would be really hard ta disinfect, so yer probably gonna have some pests. Home-made carbon filters are great, but depending on the size of yer op, they have ta be changed frequently.
What type of plants will you be growing? Sativa's take longer to bloom and have less yield, while indica's tend ta have less THC.
I agree with everyone else in starting small. Master things like PH, airflow and light wavelength (and density).
Test things out. Lets face it, if it's small and things work out, great! You go bigger! If it's small and there r problems, it's easier to fix, less time consuming and less stress.

All in all, its up to you. Nobody here is sayin don't do it, because we all want ya to succeed.
Good on ya!
PLUR