Scratch that, the Hardballer I linked to IS way to long, you're right.
Are you looking to do a film version or game version? The guns in the film are Para Ordnance P18.9's http://www.imfdb.org/wiki/Hitman_(2007)#Para-Ordnance_P18.9 as opposed to the AMT Hardballers in the games http://www.imfdb.org/wiki/Hitman_2:_Silent_Assassin#AMT_Hardballer which have rear sight placement that is different to the 1911 MEU.
In a similar way to the STALKER thread I guess it depends on whether or not you want an accurate replica of the screen/game used gun or just something that looks a bit like it. The former will be quite tricky and potentially require some custom work (there's plenty of people out there that have already been down this route) but the latter should be relatively easy. As you say the grips are readily available (if not exactly cheap) and then it's just a case of polishing the bejesus out of a metal 1911.