From the roof the rear window spans downward at an angle to the termination of the body.
Underneath I am installing a rolled boattail(imagine a river boat style) that starts at the back of the oil pan and ramps up to the termination point. This piece will be pretty swiss cheesed with openings for the exhaust system and cooling system, and a baffle to keep the exhaust heat from the cooling system. I am unsure at this point if the cooling air will be drawn from top or bottom. It may end up being something I have to fine tune once it's actually done, but I'm betting it will draw from the bottom due to flow thru the "tunnel".
The exhaust is turning out very simple, right off the cat it will dump at a 90* angle right into the center of a long glasspack to which I will weld 90* elbows on each end and be done. Summit has a nice long stainless one I could hole saw into off center a little and get some swirl effect inside, hopefully it won't be too loud.
The last difficult part is separating the engine bay from the pass compartment, I'm stuck with making a whole hatch and then an engine cover, or having a vertical window behind the driver followed by the hatch window, but I am concerned with the two windows doing weird things with reflections and such. The 2nd option would look much cooler but not like I'm showing off a quad turbo V12 or anything either.
Another idea my friend offered that was really cool is subframing the entire rear end with cooling system such that the whole thing drops out in one piece with no fluid loss. Then I could have one with the econo motor and another with a nice B-series beast
