Gym Ball Pizza Oven for less than 250 Part 1

This is the first part of putting together a pizza oven. I built this dome using Perlite, Cement, a gym ball, couple bucket cutouts, and a 4 x 4 x 1, 2 plank. All for less than 60. Perlite used: Got questions around perlite and cement amounts used, so the whole bag of Perlite was 4 cubic foot, and I used a bit more than half. Cement was the regular 94lbs portland, and I used about half that bag.