Hull plan for dusseldorf fireboat

[thedok]

Hi there I am looking for the impossible here and have been for over 18 months . I want/intend to build a dusseldorf fireboat and I know the Robbe one is good. Only problem I have is I want to build it bigger i.e +100% of the Robbe one . I can obviously buy the kit (which would be a waste of money) and copy the plastic hull but would rather try and get hold of either plans , so I can cut my own frames , or if some kind soul could copy sections of one already built I could Build one from scratch .
Or if anyone knows where there are online cross sections of the hull I can work from them .
I know I am asking a lot , but if you dont ask you get nothing !

Thanks in advance

Shane