get a extra universal cooler and bolt it somewhere if you feel the need, heat isn't really the issue with these trannys though. On the rest great job and I LOVE seeing people take care of there stuff.
2 things i would add though...Change your fuel filter and have your service center do a fuel system flush (valvoline pro kit is the best) and also get rid of your Dexcool, i know you just put it in but Dexcool is basically the reason all GM's v6's eat intake manifold gaskets. Get Zyrex G-05 (my personal favorite) or some prestone and fill it up