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Here's a pic of where I routed my battery cable. http://n631dg.davegardea.com/fuselage.html#1
This brought the power right up to my bus bar on the lower right side of my panel. I also slipped some vinyl tubing over the cable to protect it from chaffing.
I ran a # 8 Red Positive thru the center tunnel, Ground was a braided strap from the negative to frame with a # 10 also ran down the co-pilot side for a isolated ground for my electronics.