Get PETEK to respond to this topic he built a CR and is in the same height/weight world as you (and me for that matter 6'5" 270) I am planning on building a CR one for the streched capability and for other reasons also
her is the link to PETEK build site if you want to do a bit of reading about his processes (good Humor too)
http://www.birch.net/~petek/cobra/cobra.htm