The Alliance mod comes now to Sins of a Solar Empire games with all the space units which you can find in mod from the Star Wars Empire at War Force of Corruption.
This is another preview from the v1.83 update. This time about the Rebel units and their voices. Specially heroes but there are changes for most of the units.
Why do the Rebels have a Lucrehulk DCS/BB they never ever had one in the lore and if so link please.
The Rebels had the Fortressa which was destroyed by the Death Star in Legends canon.
Starwars.wikia.com
Yes, it is the Fortressa Lucrehulk Cruiser from the Death Star book.