I've been doing more testing with Opening the Sides of the Broodnest with three of my hives that each overwintered in a single 10 frame deep.
First year beekeepers usually don't have spare drawn comb, so this appears to be working well in getting comb drawn before swarm season.
Swarm season has started here, my wife saw one fly past at her friends place yesterday. But my hives are still in expansion mode.
Opening the sides of the brood nest:
Essentially it involves two steps.
1. Move both outside frames up into a new box (make sure there are no eggs or brood) with a new frame inbetween them.
2. Insert a new frame inbetween the outside of the brood nest frames and frames of honey/nectar/pollen. On both sides.
When daily maximum temperatures start getting to 15°C /59°F (After cherries have flowered) go into the hive and move the two outside frames up into a new box in the centre. I've found that a new frame in between these two drawn frames works well (make sure there are no eggs in these frames.) Then find the outside edge of the brood nest. Insert a new frame on each side the outer edge of the brood nest.
So the bees now have three new frames that they will work on. The new frames I use only have a strip of foundation. This is because an empty space encourages comb building much more than a sheet of foundation.
Give them about 3 weeks, at most 4 weeks to draw these out.
Then go into the hive and again move the outside frames into the top box. Then find the outside of the brood nest (The queen may have now laid eggs in the top box as well.) Insert new frames on the outside edges of the brood nest (in both boxes.) You can now effectively checkerboard the frames that are only nectar/honey. The new frames will be drawn out over the next few weeks.
But if I waited longer the hives were more like this, so I put on another super:
So you can repeat again putting frames into a super (assuming you use all the same size frames.) They should now have a number of frames that only contain mostly nectar. You can just move a few of these up into the super. Always move at least 2 frames up into a new box with a new frame inbetween them.
E - Empty New Frame
B - Mostly Brood
H - Mostly Honey
N - Mostly Nectar
My area has a fairly slow spring buildup, so it may not work as effectively if you have a fast buildup.