Nice build Scoop. Mine is not near as elaborate but works for what I use it for. Here is a link to my build although I never finished updating the post.
I went with the radiator fan instead of the bilge fan
View attachment 407859
While it’s helped the front tremendously, still issues in the back. Right now I have the floorboards, skid plates, and trim removed. I can really explore where the air is moving. While the radiator fan is moving a lot of air, it seems to get diffused quite a bit before actually reaching the headers. So I’m rethinking the bilge pump vs radiator fan to get a more directed air flow. I’m also thinking about making some kind of shroud/tunnel for the radiator fan to better able to direct it to the headers. Still deciding which route to take.