Even if your 16, I'd say you may still be too young to make armor from clay and plaster, even with a part time job, it is expensive enough. When you have a part time job, you should save for something useful, I use my money from my job toward a vespa (2500$) but I will use some here and there for my pep armor, and if you want a plastic set of armor, wester field has a nice set for 700 dollars, cheaper than making one yourself, or they have a full premade, pre painted set for 1400 dollars, which is about what you will pay to make one yourself.