chiark,

does that mean you still have this in-dash TV from Japan?
I thought you tried to sell it...

audio g man, (and to all other interested people, here's a resume of what I did so far, but feel free to email me if you need more details) :

yes I ordered the brackets, actually you need 4 brackets in total to do this converion, 2 for the Head unit and 2 for the heater controls. (and of course, the dash surround for the double DIN).
Other than that you have to relocate the 3 buttons (headlamp washer & adjuster and the bright button, which, in my opinion, can be simply disposed of with regards to usefulness). So, I moved the 2 headlamp buttons near the exterior mirror controller, they fit perfectly in the blanks there. If you really want to keep the Bright button you can move it to one of the blanks near the foglamp switches (again, perfect fit)
The Euro and UK car's heater controls are attached to some large metal piece (which makes the controls lie more "inwards") whereas all other models just have two small brackets on either side and also bring the controls more to the front, nicely adjusting with the non-euro dash surround. This is because the euro dash surround is much "thicker".

Below a picture, the parts you need to do this are

2 x # 11 (left and right for the heater controls, removing the orignal larger support bracket)

1 x # 14 (the double DIN surround)

2 x # 17 (left and right head unit brackets)

And be sure to have enough spare clips ready (the ones that hold the dash surround in place, you evtl. gonna loose some by removing the surround and of course they gonna fall down somewhere where you can NEVER find them again!!)

here come the pic