Well i know little about airoponics but I do know one small mother should supply you with about 15 cuttings a month .
No need for four of them unless they are differen,t strains that you like to keep.
I also think you are being a bit optamistic about your rooting times of two weeks and veging time of two weeks , I would say a month for each, twice as long.
But your idea is fine , if you get it all up and running without problems you should have a harvest every two weeks .
The only bastard is having to flush the ripe ones with fresh water so you will have a full time job flushing them by hand or changing em onto a seperate iragation system.

And to your other question i suppose you would have to get a comercial system to be any bigger as all these are for cultivating in a cupboard or a closet.

Looking after a mother is easy just look after it like you would any other plant food water light . A few days b 4 taking cuttings it is recomended to give a high N diet.

My mothers are kept on a high N diet .
If i want 10 cuttings i take 15 and trow away any that are shit and keep the rest.

Don,t expect it to run like clockwork .

Good luck
Disco........
Tech Reviewed by Tech on . Need advice on aeroponics systems I will be purchasing a new hydro system to fit my current (2) grow rooms, and need advice from anyone familiar with aeroponic systems. My room dimensions are L-5',W- 2', H-3' and L-5', W-6', H-7'. The small room has a 400 watt HPS and the large room has two 1000 watt HPS. For the smaller vegetive growth room , I intend to use half the space (approx. 2 ½' X 2' X 3') keeping 4 - 8 mothers alive indefinitely for cuttings, and the other half of the space for 8 daughters in their vegetive stage. Rating: 5