whoops: little mismatch problem. actually these parts were designed for outdistanced carbs...
(first project was to make a 92mm space between carbs to match head ports)
no big deal, took down 2mm with the angle grinder.
tack weld them washers was enough to warp the 1mm sheet.
positoned the 8 M5 nuts with the std plastic plate...
damn cheap tools
gave it some hot spots, ...
...then i worked on it with hammer and hand-anvil (sorry, donno the exact word for it).
here some other pics of the process.