...placing the turbo in the engine compartment is just wrong...what does a turbo "glow" @ 1200+ degrees? To have it located just 12" from the cooling fan intake is asking for a hot engine.
The Crown system is a great aproach. I guess you could section the turbo from the engine or snorkel the fan intake up to the engine cover, may help...Take ques from the Crown system. They did some home work. I like the fact that they placed the turbo in an aircooled friendly location, took the time to engineer heat exchangers and an oiling system that incorporates the stock oil pressure switch. I did not see, in the picture provided, the sheet metal divider at the rear of the engine. An important piece to section the turbo heat from the engine bay.
With a turbo you don't need heat exchangers... just fabriacte an air box around the turbo, have a winter and summer ducting schematic and you have heat as well as a way to section and carry off turbo heat. My thoughts, well worth the price...$0.00.