Did exist created models in .msh format ?
You mean X1, X2 etc? I did some of those for my SWBF Legacy Assets releases: http://www.swbfgamers.com/index.php?topic=10665.0
I haven't converted all the models though. I have 'working' models of X1 and X2 in Galactic Civil War garb, but so far I've only released the Republic versions.
Thanks