I know there are native hives made of poly nuc, but it is not good at all as a material for hives and specially for mating hives.
They are going to chewing up and you are going to see symptoms as "no flying bees" etc
Try to make your mating hives from wood (ply wood as an example). It's easy...
My name is Charalampos, and I am a Greek enthusiastic beekeeper.
I own about 20 hives (langstroth type), I found by lack, and ... nice to meet you friends !!
:thanks: