I was wondering if someone knows and could help me out? I would love to attempt to make a gumball machine cake for my son's 12th birthday coming up. However, I'm not sure how to go about it? Do I do gradual sizing? ex: bottom upwards like 8,7,6,5,4 etc...then put the glass bowl (which I already bought, couldn't find a plastic one) on top? If someone could maybe share in a tutorial? possibly a step by step, non-video. That would be wonderful!