Looks good to me. I just did the same thing this past weekend; I ordered 2 T's last week, one of em an A. Versicolor sling. I got a container similar to yours and drilled a bunch of holes in the top. I think your little guys should be just fine~~~
Personally I'd mark out one entire side via a grid and drill small holes all the way from the bottom to the top. The most important thing is airflow and the more spread you have on the holes the better the airflow becomes. I've seen many versis croak because of too little airflow and eventhough I don't have many arboreals I actually doubt there is one that needs more than a versi.
How did you make those holes anyway, they look kinda smudgy and I can actually not make out penetration on those pictures :?
All that is not to say that it may not work like you have it, I'd just do it anyway to be on the safe side. Good luck with your T!
Edit: Didn't se the top pic at first. That looks way better, had only seen the side holes before. But I still stand by what I said before, it's just not as urgent