You won't see much of the irminia at that size. You can catch them out but they dart away pretty quick. When mine was around an inch, she made one of the coolest homes I have ever seen.
After I transferred her my cambridgei moved in and never changed a thing.
Mike
Your OBT was a little smaller than the others but that one had some awesome webbing and tunnels.
I feel sorry for those that are not into spiders :p
They are missing out on such a cool part of the animal world.