thx mate, i have spoken to powerplay imports in sydney they reckon they have fitted a R34GTR bonnet to a GTT before, the bonnet is not wider so no quater panels needed, the only modification needed was to change those rear hinges(but some how they did not do it).
as for the gap between where the standard gtt bar meets the gtr bonnet, i have managed to source an "east bear" bonnet lid extension, which sort it out nicely (see pics)
but i still needed to find someone who can change these hinges.