Just a dubbed body, deer hair wing, and more dubbing to form a tapered front and keep the deer hair at about 180 around the body to aid in floatation. Really nothing to it.
I suspect he calls it the "mouse caddis" because it looks a bit like mouse patterns? Not sure.
Yes, it would be a low floater. Would think it would work great on slick waters.
A Brachycentrus version
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