I am aghast that the little girls at your school wear those things. I was a nanny to a girl that age for a couple of years, but she wore appropriate clothing. Why do parents let their little girls wear "These are real" shirts?! Ugh!
I used 4 brackets on each side to attach everything. None of the brackets are easily noticeable. The rear fully-built 1x5s are attached to the 2x2s by square brackets on the bottom and straight brackets on the back. The 1x5s are attached to each other by straight brackets on the surface underneath the countertop and the sides underneath. Best of luck!