Jim:
I'm basically lazy, so I'll buy the soft foam popper bodies. Sometimes, I shape them out of foam cylinders using a dremel tool. I also use round or heart shaped pieces of foam. This one has worked very well for me the last two years.
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As far as the booby fly, I've caught a lot of pan fish on smaller versions. This is the first time I've gone that large with one. Don't see why it shouldn't work.

Linecaster:
I plan to fish it both ways. On top and subsurface with either an intermediate or sinking line