My new intake is made from bent stainless tubing - the same tubing and bender was used as the headers and the 90deg bends just fit. The whole assembly is silver soldered together. The carburetor is screwed onto a plate which is then screwed onto the stainless intake chamber. This will allow me to change carburetors if required by fabricating a new plate to suit the carb to be installed.
I can highly recommend separating the water funtion from the intake manifold function. This will also keep the intake charge cool instead of it being heated by the water.