Stop in for a cup of coffee

Also, I need opinions

Attached is a kindergarten level drawing of my Dart and the rear fuel cell location.

Red is the frame rails
Black is the fully enclosed 16 gauge steel cage enclosure that replaced the spare tire well
Green is the fuel cell, 22 gallon aluminum no foam no baffles(gonna correct that mistake later) there approximately 1 inch on the sides of the fuel cell between it and the steel cage.
Yellow is a 1/4 inch thick rubber mat that the cell sits on when bolted down
Orange is the proposed exhaust routing.

Is the exhaust pipes being located there, under the frame, right next to the fuel cell a cause for concern?

I have some heat shielding I can put between there too