This is a new unit for the UEF that is buildable from the UEF spaceport (included in mod). It appears to be some UEF ships spliced together, but I think you'll agree it looks really good.
Obviously there'll be balance issues and hopefully future releases will include ships for the other factions, but for a bit of variety to your game, this is great.
Instalation. Extract the archive and then place the dh_Space_v1.2.scd file in your supreme commander/game data folder. Then activate it in your mod manager
Note: Archive is in rar format so you'll need a program like winrar to extract it. Just google winrar and download/ install it. Its free, safe and better for compaction than standard zip.