"Rookie-Touring" '69 Dart

Scheduled to arrive February 13 and leave March 5. I pretty much have the front geometry worked out, just finalizing a couple ideas on the chassis. Trying to get creative with the back brace design so I can run exhaust under the drive line and drop the front seats down an extra couple inches (at 6'6" I need all the room I can get). I'm thinking run stacked off-set 1.5" tube for the back brace, then where the kickup will be for the back seat, bring the exhaust tube between the offset tubes, and mount the muffler underneath the back seat, then spit it out the rocker... I need to get it down on paper though because everything seems to work just fine in my head...