Yeah, you're install is pretty damn good. Some of the others I've seen look like crap.
Wasn't a big deal at all. To weld the 90's I just took it an exhaust shop and asked them to TIG weld the tightest 180 they could. No other welding was required except for the lips to hold the hoses on. I welded the lips with an arc welder pretty easy. I used silicon bends where needed as my welding skills...arr...hmm...to be desired.
Mount the intercooler how you want it and take the measurements from there, cut the stainless lengths with a drop saw and then test fit. Slightly over estimate the lengths if anything, as metal is easier to cut off then add back on. I Don't have pictures yet may be able to get some up soon depending on my level of lazy.
I'm hoping for 250rwkW once i get mine tuned, I think the 450 core will be fine.