Another tip for making extended abdomens is to use 7x mono to build your body around. Once complete trim the mono at the butt end tight and add a touch of varnish, leave enough mono at the thorax end to tie to the hook shank. I usually press the mono I am going to tie in between my molars to provide a little more hold. If you string a length of mono tight between two vices (or similar) you can tie a number of abdomens in one hit.
This is a scaled down version of a technique I saw in Bob Popovics book Pop Fleyes, where he makes extended bodies for squid.
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