[quote=@Legion X51]
EDIT: Actually, the cloaking devices are only effective for ships around the size of the Millennium Falcon, etc. An SD is a bit far...
[/quote]

Did some more background research, and it is possible to cloak larger vessels, but it's the price of Stygium and the rarity of it which makes it rather inefficient to do so. So, yeah, you could actually do it, it would just bankrupt the Empire. Don't think even the Federation could bankroll a project like that and make it effective.