I like it...not completely sure about how much extract to add, though. After turning my porter into "Ben-Gay Ale" with a mere 30mL of spruce essence, I'm very wary of adding too much extract of anything. I'm sure it'll mellow out in time, but still...be careful.
Question: have you had Dogfish Head's ApriHop? A damn fine beer, it is. The apricot notes are a little more subdued that what you're looking for, but that can be doctored. Along those lines, I'd suggest going in that direction, which means a couple things: perhaps using a little more crystal to enhance the orangish color, perhaps add some more DME to increase your OG, and more importantly, increasing your IBU figures. Using what you got there, you'll end up with roughly 34.8 IBU, which is good, but I'd go a little higher. It's a personal taste thing, but I almost always find that I underhop my beers (except for my 250+ IBU barleywine...hehehe). Try adding an extra half-ounce of Cascade for 60 minutes. It'll bring your IBU up to about 48. You could go higher if you want...

You could even go so far as to replace more of the Tett with Cascade, or even some of the Hallertau too---the citrusy Cascade aromas should marry quite well with the tropical apricot flavors. Good luck!