Oops-didn't answer all your questions.
The pipes are attached to the pan by welding small tabs
to the pipes and the pan . One could also make up small
brackets to bolt too.
Up front I used a 3-row RX7 radiator with two junkyard
pusher fans. Modified my front lovers with a new panel
and made it into a open scoop type area .
Since I'm a cheap dude I'm using truck mud flap's cut
to shape to direct all the air into and out of the radiator.
Fastening them togeather with tywraps and a couple of
Easy to shape and really doesn't look too bad.