Free: Contests & Raffles.
For the cameoing part, this stuff is awesome: https://blindgrass.comIt's expensive but it is synthetic so it does not absorb water and it lasts forever. It saves some time in the morning gathering native vegetation.
I have had a couple of manufactured boat blinds (Mudbuddy QuickFlip and Beavertail) which used Cordura. It has worked well and has been reasonably waterproof. Add grassing straps and you are set to go.And I second the earlier post about BlindGrass. I have it on my layout and panel blinds and love it. I do not have it on my boat blind because I so infrequently use it anymore.
Put a little bluebeam plan together. Not sure how I want to lock the blind into place in the "up" position.