I did exactly this (though it was a Tomei centre) but it was about 10 years ago, so am a little hazy on the details. In short everything works. I used MS112 everything including ring and pinion and fitted the Altezza LSD centre. Bearings for the diff centre may have been different (can't remember if that was with the Altezza or MA61 centre) but it just needed an ID to match the centre, OD to match the housing and normal width.
So if you can, check the ID, OD and width of the Altezza and MS112 centre bearings. If they differ anywhere you need to find a suitable bearing that has Altezza ID and MS112 OD, width should be the same.
Good luck
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