The two larval patterns look great! On the cased larva, you might want to put a turn or two of white dubbing or a white ostrich herl just ahead of the case and just before the head/thorax area to simulate the white body just barely protruding from the case. The color can be a very light tan as well as white, as they are really a creamy white in color.
You will definitely catch fish with these!
I will take you up on your offer! Clearly they work, as you caught me!! I will PM my address.
Cheers,
Frank