Dont wait,get going right now,also do not put all your eggs in one basket with the diy aero cloner,most new cloners have problems with cloning so i say if you have not allready perfected your clone technique then start now.
Get the aero unit going & use other methods at the same time,get a humidome & sponge plugs & fill it up with cuttings,i would also start some water clones & put them in a window ,making sure to change water every 3 days.
You should also be getting the clones ready early because of mother plants,it takes 2-3 months to get a clone to the point its a mother plant,starting the mother clone process should allways be done as much in advance as possible for one reason,its much easier to keep clones & mothers healthy while your getting other shit in line than it is to rush at the last minute.
Even very experienced growers like myself have been taken out of cycle by waiting too long to clone.