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It's essential to construct an ‘invention prototype' much before buying the tooling for building the product or seeking contract manufacturers. Many a times, it so happens that the inventor might, in reality want to build a prototype much before getting too fancy regarding computer drawings. He is likely to burn up loads of cash on ‘engineering drawings' when possibly what he needs 1st is the papier-mache clearly showing him what is being tried by him. If that is the case, he is advised to revert to computer-aided drawings. Assessing the proper time for prototype is not all that tough. It just requires a proof of workability of the product invented by the concerned person.
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