I've been running the Cabelas Northern flight blind for the last 3 years with absolutely no problems. I didn't buy the rain/weather shield. Instead, we layered in the following order:
Black heavy duty tarp (wind/rain layer)
Camo burlap (depth/holding layer)
- we left enough to extend around the motor and act as a motor cover as well
Avery Killer Weed zip tied in small bunches.
I start from the bottom and lay it on like roofing shingles. Ensuring that there is enough to overhang to water level. I should mention that we zip tie through the burlap only and Last, I throw on as much natural cover from the area we're hunting as I can find.
Some might call it anal, but I am a beliver that you can NEVER have too much camo.
We also made some covers from 1/4 in plywood to cover in between hunters otherwise, it will look like a gaping hole from above not to mention, it helps keep the heat inside, and allows us to hide better.
At the end of the hunt everything rolls up nicely inside the tarp so we don't have to worry about losing any camo while running down the highway.
I've run that boat/blind across several states over the last few years and have never had a problem.
Hope this helps!