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Will I absolutely NEED a front and rear camber kit or just the rear kit?
Should you get camber kits? If I went with the GT-F springs, no. For the GT-S, I probably would just to save my tires. Either way, you don't absolutely need them.
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Will the stock sport tires (275/35) fit safely onto an 11in wide wheel? The stretched look is not as much of a problem as is the safety concern.
I've seen worse, but I wouldn't do it. That's too much of a stretch for me.
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Will I have need further modification to fit 19x11 +15 wheels on the rear with this setup?
I have 19x11 +15 with 305/30 tires in the rear and I could probably go a few millimeters out. No modifications necessary.