You should check out
http://www.locostbuilders.co.uk they have a lot of people there converting bike itbs for automotive use like this thread
http://www.locostbuilders.co.uk/view....php?tid=39872.
Also the gixxer itbs unbolt from each other and you can add spacers between the tbs to get the correct spacing. That would make the intake manifold easier to build much more efficient, less bends before the port.