Rick,
I doubt we'll ever see a "replacement" for Val-Oil. Mine is holding out OK. My hope is that I might deplete my stockpile at the same time I don't have the hand strength to carve anymore. That would be perfect timing [crazy].
The patterns for wings (as for each bird) come from scratch drawings. With a basic knowledge of what happens with the feather groupings where the wings connect & how they layer & fold, it's not too hard to figure out what should happen. A good supply of wings saved in the freezer each season for use with dummies while dog training also comes in handy, as they go a long way toward answering questions about the structure of wings on a deadmount, as well as and the various contours that can be incorporated to make them look effective. I'm finding that the biggest challenge is deciding which details to include and which to leave out, so that the viewer uses his imagination.
Just turned up the heat and will be headed out to paint as soon as the studio has had time to warm up a bit.