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1) The only benefit a P12 head has over a P11 is the valve stem size (thinner by 0.5mm = more flow). Outside of that, no real benefits
2) P12 has better cams, valve cover, coil packs and single solenoid. If not building and reusing all those parts, that's the way to go
3) Welding a VE flange to GTi-R runners would pose an issues; not only do you have a deal with the boses from the ITBs, the plenum is not flanged for a TB. You would also have to get that welded (unless you want to keep the ITBS). Also, other fab issues that will arise due the runners not lining up/different shape, etc
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