darts, no prob
 

It must be designed to handle a continuous flow of air, the blowers are running all the time, where is the air going then?

Another dart hole couldn't make a substantial difference. They're not balloons.

By the way, I would never suggest any other kind of dart than steel tipped. bleagh

Yes, 2 blowers running continuously and in the second picture you can see it's erected over a truss frame so it may droop but it can't collapse. :)