Does anybody know where i can get a kit for a vw schwimmwagen?

i recently came across an amphibious vehicle know as the schwimmwagen and it was made by Volkswagen in the 50's. problem is that i cant seem to find a place to buy the kit. im a pretty big bug guy and enjoy older vw's and this kind of thing would be perfect for my collection. im not looking to buy a completed car, i just want the kit so i can build it myself