Trial fit sump tank/right rear seat bits, then ooger out glass/foam down to the drain valve hardpoint, using these nifty sanding cone/drums I found in a Harbor Freight. Made it real easy to profile the glass and foam neatly.
Have a sudden attach of angst. My sump tank bottom was assembled with urethane glue. Does it like petrol??? I make 2 test pieces, and submerge one in ULP.