I was so close to throwing in the towel on the dual radiators, I wanted completely ducted fans but realized it was going to be a painful time-consuming process to get that done, and I would have had to go with a smaller fan. So I simplified the whole thing by mounting the SPAL fans directly to the radiator (actually to the frame adjacent to the radiators). Should work almost as well as a fully ducted fan.
Got the cooling system finished. Per my other post, I could not bend the tubing more than about 10-20 degrees without kinking, but was able to make some gentle bends where required.