Vigo_The_Carpathian
well kingpin I have about 250 saved up for one right now if I had the right dimensions i could make and possibly sell clay bucks to people cheaper than what it should be but I've looked and thats out of the question tried to make my own but that really didnt work
You may have to save up to double that as I believe even a bog standard cast of a Proton Pack would run up to at least $500. However if the idea was to make a buck from someone's kit then that'd that isn't recommended as it's frowned upon to make a cast of someone's work and then sell it on without their permission.
However you could obviously save yourself some money if you did build it yourself and I would certainly encourage you to not give up. You can find plans on a site like
GBProps or
GBProject which can help you to build the Pack as well as some of the other well-known pieces from the movies.