The Gladius Strike Force is the Detachment in C:
SM that allows you to run all three of those Formations; there's no other way to put those three together, so you're sort of stuck with that if you wanna use the rules for those. I guess you could just make most of this out of a
CAD or by playing Unbound I believe, but it'd be a waste! You have free special rules
In terms of whether this would work, like I said, I think you would struggle against people at 2k pts who are making use of their Special Rules via Formations and Detachments, and using a range of different types of forces, i.e. tanks, flyers, and
TEQ. And like Nevelon said, one of the main benefits of playing Ultramarines is being able to use their great special characters, like Tigurius or Sicarius (both of whom would help your reserves arrive on time.) If you're not using those or making use of the Ultramarine's unique detachments (mostly the Gladius double demi) I think you'll have a tough time.
As an example of what 2k pts look like in a Gladius, here's a totally bare-bones build showing how you could include all the units you listed. This gives you two Ultramarine special characters, 10 Razorback transports with Heavy Bolters FOR FREE, 83 models between Terminators, Scouts and regular marines, and 371 points left over for special and heavy weapons. It would be a ton to buy and paint, but this is what your opponents at the 2k pts level will be able to bring to the table using Ultramarine special rules.
+++ Ultramarines Gladius Double Demi (1629pts) +++
++ Space Marines: Codex (2015) (
SM Gladius Strike Force) (1629pts) ++
Chapter Tactics [Ultramarines]
+ Core (1005pts) +
'Battle Demi Company * (525pts) [Captain Sicarius]
····Assault Squad [4x Space Marines]
········Razorback [Twin-linked Heavy Bolter]
········Space Marine Sergeant [Bolt Pistol, Chainsword]
····Devastator Squad [4x Space Marines]
········Razorback [Twin-linked Heavy Bolter]
········Space Marine Sergeant [Bolt Pistol, Boltgun]
····Tactical Squad [4x Space Marines]
········Razorback [Twin-linked Heavy Bolter]
········Space Marine Sergeant [Bolt Pistol, Boltgun]
····Tactical Squad [4x Space Marines]
········Razorback [Twin-linked Heavy Bolter]
········Space Marine Sergeant [Bolt Pistol, Boltgun]
····Tactical Squad [4x Space Marines]
········Razorback [Twin-linked Heavy Bolter]
········Space Marine Sergeant [Bolt Pistol, Boltgun]
'Battle Demi Company * (480pts) [Chaplain Cassius]
····Assault Squad [4x Space Marines]
········Razorback [Twin-linked Heavy Bolter]
········Space Marine Sergeant [Bolt Pistol, Chainsword]
····Devastator Squad [4x Space Marines]
········Razorback [Twin-linked Heavy Bolter]
········Space Marine Sergeant [Bolt Pistol, Boltgun]
····Tactical Squad [4x Space Marines]
········Razorback [Twin-linked Heavy Bolter]
········Space Marine Sergeant [Bolt Pistol, Boltgun]
····Tactical Squad [4x Space Marines]
········Razorback [Twin-linked Heavy Bolter]
········Space Marine Sergeant [Bolt Pistol, Boltgun]
····Tactical Squad [4x Space Marines]
········Razorback [Twin-linked Heavy Bolter]
········Space Marine Sergeant [Bolt Pistol, Boltgun]
+ Auxiliary (624pts) +
'10th Company Task Force * (164pts)
····Scout Bike Squad [Scout Biker, Scout Biker]
········Scout Biker Sergeant [Bolt Pistol]
····Scout Squad [4x Boltgun, 4x Scouts]
········Scout Sergeant [Bolt Pistol, Boltgun]
····Scout Squad [4x Boltgun, 4x Scouts]
········Scout Sergeant [Bolt Pistol, Boltgun]
'1st Company Task Force (460pts)
····Sternguard Veteran Squad
········Veteran [Boltgun]
········Veteran [Boltgun]
········Veteran [Boltgun]
········Veteran [Boltgun]
········Veteran Sergeant [Bolt Pistol, Boltgun]
····Terminator Assault Squad [4x Terminator]
········Terminator Sergeant [Two Lightning Claws]
····Terminator Squad [4x Terminator, Terminator Sergeant]