i use 90Ã?Æ?Ã?â??Ã?¢ââ??¬Ã?¹Ã?Æ?ââ?¬Â¦Ã?â??Ã?¡ angle aluminum on bolted on the ouside.
http://www.andrewbroussard.com/e107_plugins/forum/forum_viewtopic.php?157548.8875#post_339305
look at my scooter on that page, the reinforcements are kinda hard to see, part is almost impossible to...