I would remove 1 cultist to get below 1k so that I dont have to sue you
I would recommend replacing the Sonic Blasters with another blastmaster, 2 blastmasters in a Havoc Launcher Rhino is a great way of clearing crowds. If you do this, also think about removing the Doom Siren from the sergant.
The problem with the squad of Noise Marines is that it does not have a focus as of now, either go heavy on Blast Master, or go heavy on Sonic Blasters, or give them Close Combat Weapons and a Doom Siren for close up debauchery.
All those bikers are a bit too much for a lord escort in my opinion, 3-5 is often enough to get the lord into close combat, so I would split them into two squads so that you have multiple threats, preferably with some sort of Special Weapon like a couple of meltas in each squad.
Blast Masters will wreck Marines and Eldar, which is nice, and orks, well, theres a lot of them, so the burning brand, the havoc launcher and the blast masters are good.
Your biggest problem will probably be the
GKs since you dont have that much AP2 and the Eldar, because Eldar are ridiculous
Seems like a fun list.