is that a frisbee and q-tips?? if so i like your style!
theres no better way to get into the prop hobby then to make some stuff yourself.
accuracy..who cares when your learning to build and having fun.later on you will learn skills and make better props and most importantly,understand why these props cost so dang much.
just a thought-if you need to make "raised ribs" again.go to dollar tree and look at plastic containers.all shapes and sizes and alot of the lids will have the raised ribs that you can cut apart and use.cheap and easy.