Thats a small budget
? I could try n do it as a kinda challenge I suppose, lol
... Would you have a veg section and a flower section or just a main room for a harvest every 3 months? Would you be happy using CFL's or would you prefer HID lighting? LED's are out of the question because the cost is so high (for the good ones). Computer CPU fans are both cheap n easy to install, The filter will be the only costly part.. unless you use a cooker venting filter, available from most hardware/home stores.. Would you like to grow in soil or Hydro?? I'll be happy to help ..if ya want? - STELTHY
Ive been helping another fellow grower aka BUDBABY build a cupboard/cabinet stealth grow from scratch here's a LINK to that
consider it reference if you will
https://www.rollitup.org/grow-room-design-setup/390631-stealth-cabinets.html
and here's a LINK to my thread.. This thread has tons on stealth cabs etc etc, and may help you on your mission
https://www.rollitup.org/general-marijuana-growing/320402-stelthys-600w-hps-project-new.html
Anyhow hope that helps dude
- STELTHY