Aw, I just love baby pictures!
I remember how excited I was when I germinated my first tomato seed.
50% germination at what, a week to 10 days, or maybe even not that long? Not shabby at all, good job! I hope you have room for 75 to 80 plants! Do you plan to do another sowing later for insurance? I am not sure, but I think Fall plantings are possible in your zone as well. I like to stagger and extend my growing season down here, but not sure what your windows are like for your growing season.
I even think I see true leaves starting on one of the seedlings on the right.