In places wherein you will making something very intricate, you will need devices such as cmm fixturing sets. Manufacturing companies most of the time use this kind of equipment because they are assured that everything is being placed accurately thus they are confident that they will be producing perfect products as well.
Cmm fixturing devices come in different brands and only those that genuine ones can keep your business operational and accurate. There may be cheap ones but the output would always be questionable and in that case, your products will have a low quality as well. You will eventually lose clients if that happens.