Tiberian Sun: Rubicon is a standalone mod aimed at revising and remastering the Tiberian Sun experience while keeping it true to the original.
The Dropship Bay is a GDI building that was planned for yet eventually cut from Tiberian Sun. It likely would've functioned like the Starport in Dune 2000, where you can order a bulk of units to be delivered from orbit.
While the Dropship Bay's graphics still exist in the game files, its proper function is lost or was never implemented. With limited options, I've opted to bring the Dropship Bay back as a special factory for GDI. It produces vehicle units like a normal factory, but the heaviest units (Juggernauts and Mammoth Mk. II) are produced exclusively via the Dropship Bay.
I like the fact the Juggernaut now moves slow as it does in the FMVs instead of bouncing around like it did in vanilla :)
That is excellent!