Ahh, so cool! SolidWorks LOVES cplanes! Remember you can set a "template file" with the MoI ini file, to always have the cplane on startup....

But it sounds like Michael may be able to tweak that functionality in the future to eliminate the hoop!

Anyway......

[Edit]

Just to be sure.... the custom cplane is set in MoI, correct? (Not from within SolidWorks)