Im knocking Kal off and he has been a great inspiration as well as resource. I love the idea of the hop stopper, but reading other reviews brings up some very minor issues.
The biggest drawback based on reading a lot of reviews concerns cleaning the Hopstopper/taco. Getting all the little bits of hop pellet out of the inside seems to be an issue for some. Considering this thing is sewn or crimped together, I would think there would inevitably be small hop peices left inside.
I'm thinking of simplicity both in use and in the clean up. I can buy a 24"x24" 30x30 mesh in 316 SS for $30, cut it to fit and just lay it on either the blichmann or a peice of preforated sheet for support.
The advantages on paper? 1) Very large surface area, 2) simple to build and clean.
The disadvantages are (I'm guessing here) 1) Its unproven at least in my BK 2) Leaking around the edges 3) who knows...
Seems so simple that I thought someone might have tried this. If not I guess I'll be the guinea pig on this

.
If any one has ideas or wants to throw out some design considerations, I'm all ears.
In the mean time, I have (2) 12" squares of 30x30 mesh I bought to build the double taco. I'm going to try to return to Mc master and get the 24" square instead
Here goes nothin'!