I recently bought some CNMG120404 inserts to try and was originally planning to make some holders. However I found some for a reasonable price on www.shop-apt.co.uk. 16mm shank CNMG insert holder

To make these work in my AXA tool post with the compound mod I just needed to remove 3mm from the base of the holder. This was quite easy to do in my mill (I used a 30mm carbide insert face mill).

Definitely pleased with the result. Now just to modify the left hand tool I also purchased and then make a tool to use the obtuse cutting edges (the ones I have seen on the net have too large a shank size and are too costly for me).