Since you also plan to move your radiators back into the wing, see if you can rig up a "heat exchanger with a box on top" in line with your cabin air intake. On really hot days, dump it full of ice before takeoff. You get to stay a little cooler under the solar collector. As the ice melts, you have to get rid of the drippings. Just run a drip tube to an exit that's in front of the radiators. Presto! Two birds, one stone.

Monty, Since you are "sort of" duplicating the ME109 cooling layout it is worth mentioning that they used a split flap inboard that could produce a low pressure area into which to dump the climb and high AOA air. The system worked well untill the increasing HP forced the need for P51 type scoops. Additionally the Main competiiton (Spitfires) used a similar Rad layout.

Bill Jepson