I am guessing you are talking about Bolt XBR? It's a very awesome frame! I was considering adding webs for reinforcement, and may still add them as an optional

I am guessing you are talking about Bolt XBR? It's a very awesome frame! I was considering adding webs for reinforcement, and may still add them as an optional extra bolted under the main frame in the front and the back. But the durability should be solid, of course I don't want to say much before I test it properly, I have a motto of under-promise and over-deliver :) What I really wanted to concentrate on in this design is thrust path for the motors. Bolt is pretty good about this, but still not ideal. Many other frames really don't take this into consideration at all. But if you have a prop that develops 1,000g of thrust, but well over 30% or more of the area under the prop is blocked by the body of the quad and the arms, you are not really getting 1,000g of thrust at all. This is also my main objection to tilt rotor designs. I tried to slim down the arms as much as possible while maintaining rigidity, and still being able to place ESCs in the thrust path to keep them cool. Again, I don't want to say much until I build a few final design prototypes and test them though :) If you would like, could you send me an email through my blog. I would love to talk to you more, perhaps see if guys from your group would want to test a prototype when I have a few done.