Hmmm... Not sure how it will do. This is one of those types of builds you would have to play to see if it works the way you think it will. The lack of defense and/or resistance is troubling to me. Power selection wise... I know I would definitely dump force of nature and take conserve power instead. Force of Nature is only up for 2 out of 5 minutes and then has the heal and recovery penalties. I love TA... I know a lot of people don't care for it, but I like the jack of all trades approach.
This is not the build I would personally do, but if it's something you like and can make work for you...then I say go for it
I've enjoyed TA quite a bit myself. I think the big part of getting that Defense covered is in Flash Arrow. It allows me to get into the mid 30s on ranged D whenever I fire it off. Power boosted it gets me to 40%. So, I wouldn't mind finding about 5% more ranged D.
It also helps I can basically invis. myself with FA and Stealth.
Then there's the holds and stuns and kdowns and other stuff the set can do which should make it a fairly sturdy combo.
I should be able to aoe about 1000 or so damage every 35-40 seconds which is what is really exciting about this combo.
I only really included the FON as a get out of a jam kinda power.
My other options are the ever popular dark or soul sets which both have strong reasons to choose them.
As far as the build I have... we do have some differences of opinion on builds, but I always appreciate how you go about it. I see the invisible, pseudo controllerish nature of this build being able to keep up with the lack of defense.
Here's hoping that I can test out my theory in the near future.