Super Mario Galaxy, if I'm correct, uses the .BRRES format. What you will want to do is extract the files through Dolphin, then open them with BRRESViewer.
As for Kingdom Hearts, I know there's a KH model viewer/exporter, but I don't know if it's compatible with maps or not.
As for Kingdom Hearts, I know there's a KH model viewer/exporter, but I don't know if it's compatible with maps or not.