It looks great - I am just starting to build one. Do you have any recommendations on the fire monitors? I am going to use Robbe and make them rotate.

Do you find the twin motors too much ?

I made my own from bits of tube and old coins for flanges. The nozzle is just sleeved down with progressively smaller tube till it squirted about right. Pump is a standard grapnel unit. Hopefully this link to a photo blog will work. https://picasaweb.google.com/102817163504371499744/RAFCrashTenderModelBoatBuildKitshack46InchVersion
The link will give you details of the motors and speed controllers and the props I used. it's quick!