hmm... That is similar to what I was going to, do minus
the large diameter tubing from pressure-outlet to rad.
@pHaestus: You wouldnt happen to have received this
after placing an order for a 3/4 D4, would you?
3/4 D4 
Anyways Ill do more research on the pro's and con's of
3/8 (got past that very long ago, but oh well)
SenC.