The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
Shawn,
... soft-hackles... present the simplest way to be prepared for the range of possible caddis situations that might arise on the stream. They could pass as larvae, pupae, or egg-laying adults and can be fished in myriad ways. Does that seem like a good place to concentrate my tying energies?
Yes, though I wouldn't give up on dries all together. Here's a dry pattern that has worked very well for me as a general caddis dry. I trim the hackle underneath for a flush float if the situation demands. The bodies of caddis are generally much shorter than the wings. I don't like the stiff wing sticking out too far beyond the bend for better hookups, so I just tie the bodies short.
Hairwing Caddis, olive green #18
In the image below you can see some samples made from laminated clingfilm and foam. They are colored before laminating and are all less or more translucent. Color one layer and trap it between several other layers, then laminate gives you the result shown below.
The medalion seehting looks very nice, I've never worked with it but it has the same nerved texture as the clingfilm.
Anyhow I post this picture to show the result and flexibility you have when combining these cheap materials.