The Imperium would win. While the spaceships look big in Star Wars they are shit compared to the Imperiums which are measured in kilometers. The storm troopers would be powerful IG but would be alot weaker than SM, and the chances are there wouldn't be more stormtroopers than SM. The only things Star Wars have to beat the Imperium are the Force and the Death Star. And there are not enough Jedi/Sith to win and the Death Star is proven in Star Wars to be beatable. Taking out the Jedi would be difficult though, they could slice SM in half as easily as a stromtrooper, and it would be the ultimate CC weapon, something like no armour or invunerable saves allowed. BU the Imperium would win with ease, I can't even bring myself to suggest that Boba could beat Shrike. Altough Han Solo and Chewbacca would kill everyone with there pure awesomeness and the Millenium Falcon would not be defeated.