Check these out at Guru-Planet:
http://store.guru-planet.com/customfigures.html

There's a couple feamle Vipers and a female trooper. The recipes look pretty straight forward, just a reapiant of a femail figure with the Viper/Trooper vest or harness. A couple of the Vipers look like thay have the Baroness disguise vest that came with Lady Jaye from Spy Troops. Not perfect, but you can tell what the customiser was going for.

I'd say start with a 25th Scarlett. Her body suit is skin tight, so it's essentially like your starting with a naked body on which to mold or paint, some Baroness versions might work as well.

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Some people, when trying to avoid thinking about those things that cause them pain, turn to drink, or perhaps food, or drugs... I turn not to any of those... I collect action figures, turning my mind to the hunt, so that I might find a mote of peace... Over the years, I've found that alcoholism is much more socially acceptable by far.