So I have started building shallow frames and supers for my nucleus top bar hives. I plan to focus on the short nectar flow we have from April to Jun and supers will force the bees upwards during that time. Once the flow is over the supers will be removed and the bees will focus only on the top bar hive body. After that I will very likely let them swarm or/and do splits.
This queen excluder is too small for this hive and will be used in my 8 frame vertical hives. I will need to buy a few new queen excluders for my TBH nucs.