You probably have issues with te game folder being in Program Files (called \'Programme\' in German if you don\'t know it ;P). Move it somewhere else or give normal users all rights on KSP folder or run the game as administrator.
\'Cause I dropped the MuMech stuff in the latest version of my plugin. I\'m still not working on this \'cause I have to finish the last school stuff. Half a week and it\'s over but that also means that I\'m running out of time...
They won\'t stay 1m, the\'ll be auto-resized to have a diameter that could hold 1 Kerbal. You\'ll be able to turn that off, but then you\'ll break compatibility to other parts.