You might get some interesting looks when you take your scantily-clad mannequin outside for some test shots, Jerry. What are you using on the camera to trigger the strobe? Or does the G12 have support for this like the 7D and 60D? I just started experimenting with something similar. I have a PW II connected to my Elinchrom 600RX strobe and a FlexTT5 on the camera. I can shoot about sync speed that way, but I haven't been able to get 1/1000 shutter speeds yet (I still need to do more playing around with this).
Cameras: 1DX, 1D4, 20D, 10D, S90, G2
Lenses: Canon 10-22mm, 16-35mm f2.8L II, 24-70mm f2.8L, 70-200mm f2.8L IS, 300mm f2.8L IS, 200mm f2L IS, 50mm f1.4, 50mm f1.2L, 85mm f1.2L, 1.4x TC, 2x TC, 500D macro, Zeiss 21mm
Lighting: 580EX, Elinchrom 600 RX's, D-Lite 4's, ABR800, 74" Eli Octa, 100cm/70cm DOs, Photoflex Medium Octa and reflectors, PW's, Lastolite Hilite, Newton Di400CR bracket