Wow, Nice find! Those are some pretty cool Iris designs. I'm not sure exactly how some of them work. in all the examples the part that moves with the handle makes sense, but it passes over the top of another pin. -confused on that, How does a pin pass through the blade below it? and the other end seems to be free floating. I don't understand what makes it move the way it does. almost moves in a circular pattern. But nice find anyway. Thanks! +rep
As for the other suggestions. Thanks, I really appreciate your guys input. I have redesigned the blades so they have 3 times more overlap than before and will still yield the same size opening. I designed them wider so there would be more material that overlaps each other. that way it should account for the "Slop" in the pins. I am still going to laser cut them when I get back from a work trip on week of the 10th. I've been working on the radiator mount and fans for the top. I should have some pics up later tonight. I'm still undecided about the door for it.
Later!