I am in the same boat, it's my first attempt at doing major cosplaying too. I have some basic materials but everything else I got to budget and get as well. So I understand that. Have you thought about including the costs for all the rolls of filament used as well? It might really increase it but could put even more in sheer number of how much your armor could cost. Same way I bet with more Foam made armor too since those add up as well.