Do you think you could put a lock on your cupboard door and your parents belive there is just valubles in there?????
What about the hum of the fan?
The smell will be very hard to eliminate even with charcoal filters.
And keeping the best four after veging ? If your lucky you will only have 4 female plants to flower out of ten seeds anyway.

Parents arn,t stupid , they know the score.
And six coppers banging on your door to come and take you and your parents away isn,t much fun either.

I would go for an outdoor crop at this time of year untill you got your own place , if you can find a place to plant.

Good luck and be carefull.
Disco....