i built a 9x9 insulated, sound proof, climated controlled room with co2 enrichment this past year. i did all the work myself except for wiring the split, the flipbox and the natural gas fitting and i cheaped on the lights no led, no hydroponics equip and it still cost well over $13,000 i dont have a full list but just off the top of my head not including any building materials since most items have tripled in price at the hardware store. either way your shooting way to low in my opinion.
$2400 - 2 ton mini split diy
$1000 - co2 burner/controller/pay gas fitter
$1000 - 4 cheap digi ballasts
$200 - bulbs
$300-$400 - 240vflipbox/pay electrician to wire that and you diy split.
$500 - reflectors
$400 - humidifier
$300 - cheap dehu
$200 - climate controller
?? - carbon filter/ fans
?? - pots or hydroponics equipment
?? - ph/ec testers
?? - nutrients
?? - trays