That is interesting.
Not so much the part where you cannot remember......

, but the fact you have reverted from your original toward more of Marks preference of design.
I too started with quite a small thorax, but used the famous 1/2 kilogram spool of orange yarn for my abdomen. They worked alright, surprised me in fact as they do not really imitate a natural here, but they are a top producing soft hackle late Summer when fished as a single in the top couple of inches below the film. For me, once discussing the pattern more with Mark and finding the correct floss, correct proportions etc, I found them to be a much better fly early season through to the start of Fall and at pretty much all depths- yet they still do not really represent any natural within local waters.
Be interesting to see how your own experience goes as your season progresses. I would still be tying some of the smaller thorax models to fish in the top of the water as aborted duns or drowned spinners.
