We had many discussions in the DIY section in the past about doing something like this...the problem always was finding something with actual *down* in it and not a bag of feathers with *some* down in it.
It sounds like you did well finding those specific pillows. That's a steal of a deal if they are less than 10% feathers (hopefully less than 5%).
You'll know if you got good down by how many feathers poke through your material. If you constantly find feathers poking through the nylon, then it was an OK deal. If you find very few, that you rocked this one and I'm jealous! LOL
Warbonnet Blackbird 1.7DL Green
Switchback (w/Netting) 1.9DL Green
Grizzbridge (aka The Loaner)
Grand Trunk - Deep Blue
Trek Light in Olive
Backwoods Daydreamer Winter Tarp - Red
DIY "Deluxe" in Olive
Warbonnet Superfly in Olive