Wowzers. That is one niiiiiice soap cake.
(Jola, I know lots of folks separate everything they use for soap-making, but I don't. The stuff I use gets used for cooking as well. We haven't dropped dead yet. For a cake pan (don't use aluminum), I can't see why it would be any problem at all since by the time you un-mold, you've basically got a cake tin full of soap. No health hazard there as far as I can see.)