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Female castlist on screen:

Cassandra Lord
Cassy Bright
Rhona Harris
Summer Dream
Glory Shade

I could make caps only with grabber (but they are larde and one could be able to cut proper one from this block) - last raw is Vivian Schmitt:

[IMG]http://img216.imagevenue.com/loc368/th_69628_exclusiv_7_123_368lo.jpg[/IMG]

The short blonde is Grace; the black-hair in the caps
to to the right think is Maria [5].

Thanks again, jj, I found a full cast from Bordello:

Kyra Badlex
Helen Benoit
Cocoa Brown (as Coco Brown)
Summer Dream
Glory Shade

And here is available GQ caps from each scene of this movie (one can see from scene 4 or frontcover that Vivian Schmitt is missed).

Direct comparison of casts from both films allows to suggest:

Summer Dream & Glory Shade are Vivian and Maria [5]

Kyra Badlex & Helen Benoit are Donna Colada & XNK3285

Cassy Bright & Rhona Harris are Grace and unknown brunette.

In 'Casting by Coco' apart from Coco there are three others:
Daniela Nanou [as Eileen Walsh];
Maria [5] [by elimination from your info above, as Glory Shade];
Nicole [by elimination here, as Tracey Lords].

Therefore Vivian Schmitt's DBM alias must be Summer Dream; as
confirmation this alias and Viv [but not 'GS' or Maria] also
appear in 'Checkpoint'.