Iam from Ukraine and in my country many ppls who catch swarms in forest and woodland belt.
So i think ur trap not really good. Why?
1. Free volume should be 50-60 liters
2. Under the framework should be 20-30 cm distance
3. Better to do a vertical form
4. No disguise, it will be seen on the tree
5. The expensive construction, will be a pity if stolen. (In Ukr it is rarely, but possible)
6. Round the entrance to the hive, hornets or wasps can outrun bees. Need to do a gap of less than 1 cm, the length is not important
If u have some questions. My skype pr1zZzz or ask here. Sorry for my eng...