The inter room hole is too small too. There are two entrance holes at the dog kennel which most people would do that if later more swiftlets are using one of them then the other one shall be closed.
Well my opinion, Ok mine, my opinion! Other sifu may have theirs. I don't believe in two entrance Holes I believe one should know very well already where is the best entrance hole should be placed.
If you have two entrance holes that's mean you are uncertain and you have doubts about your own opinion.
Of course many still choose to have two entrances, well let it be. I understand from him that the stair case will be the inter hole. If possible hack a hole at the appropriate place. For staircase inter hole it takes a long time for birds go down.
Heat is the problem with this farm as you could see he is using orchard netting to reduce heat. I guess initially at the beginning of the construction works he should have built walls that could reduce heat (insulation, wall thickness,etc)
For this farm more ventilation holes are needed. Making sure it is placed at the strategic area to have the effectiveness.
I guess his advantages is his farm's location. Located in Kelatan , a Swiftlets Prime Zone area any farm build there will easily attracts birds, even some farms that have the worst design still could attract birds to nest but population will be stagnant.
Well all are welcome to ask and give comment , there are no right or wrong when asking question , all are welcome please email me. firstname.lastname@example.org Thank you.