i found that using the above suggestions combined with a dense mesh exported from moi and no smoothing in 3dCoat worked quite well.... not perfect but useable
I didn't find 3Dcoat really impressive at first, but this new voxel modeling stuff (alpha) is really amazing.
Just a collection of MoI 'primitive' melted, quite funy.
@ PaQ : I have made the French version of the interface of this crazy prog of Andrew ;) 2.xx
(not yet the 3.0 because the finished version is not finalized!
The Voxels Volumetric is a true gem!