Thanks very much for the feedback Muton and Double Tap!
Dremelling heads - I use dremel heads from a B+Q grinding pack, with a torpedo shaped hard grinding head. You need to take it slow (I burned and melted the plastic on setting

and widen the hole at the bottom. Keep trying the head to ensure your drill hole is going on straight.
Milliput flak jacket - if you don't want articulation, superglue the mid thoracic joint. If you do want some articulation, get cling film and wrap around the thinner lower torso. All of the lower torso needs covered or milliput will stick to it. It needs to be tight too. Then wrap the milliput around the lower half, biulding it up. Neck scarf then vest then add the hooded part and finally the surface detailing.
My Eagle is dry now. There's maybe 40 degrees articulation in the mid thorax and the milliput black is OK un painted and is about 3-4 mm thick.
I've painted Torpedo black for Barracuda too.
