Thanks Finman,
I would agree that two frame nuc is probably going to be a very weak colony. I am planing to build the colonies into 2 brood boxes and then transferring 5-6 frames into 6 frame nucs.
I am not 100% confident with expanding the colonies into 3 brood boxes each, I think this will take a very long time as I do not have any drawn frames.
Colony draws frames when they need.
Limiting factors are the size of cluster and the time of brood development.
If you have one box full of bees, they can grow 8 frames brood. It takes 4 weeks, when the colony starts to grow, and it can achieve 3 box size after 6 weeks.
If you have 2 frame colony, it can make only half frame of brood. After 4 weeks you have got about 2 frames of bees actually your colony has not expanded.
A good queen, like buckfast can fill 2 langstroth boxes brood. After 6 weeks that hive can be 8 boxes full of bees.
You understand, that the queen msy be what ever good, but it cannot use its ability to lay, if the nuc is practically nothing.
If you have in July 8 boxes bees in one hive, you can make quite many hives from this gang.
But if the queen is an average layer, you may have 4 boxes bees who knows?
If the swarms escape from you, it is called "experience".