I think your list will do fine in some friendly games and seems like fun to play, but i would make some chamges if you want to step it up a level.
So instead of Lord commissars, use regular commissars. Then replace them with 2 more company commanders. Orders are amazing and provide lots of utility. Right now you have 9 things that could be ordered but only 4 orders a turn with the platoon commanders. Next ditch them as well. They suck compared to a company commander who only costs 10 more points but gets another order. Next unless you have a deep love for them, replace every flamer with a plasma gun. They are just better in every way, barring some catachan shenanigans. Also lose the vox casters, since they can pretty much just buy another company commander, which is better and achieves the same result. The 3 heavy flamers on each russ is a huge point sink, consider running just the cannon and a heavy bolter. It will save you a load of points. And those heavy flamers would be much better on scout sentinels, who get a free move before game starts and are cheaper. The plasma cannons on sentinels is dangerous as a gets hot roll just kills you. Also if you break your sentinels and leman russ into individual units, you can field a brigade for a tasty +9 c.p. instead.
Thanks for your advice. I made some changes to my list accordingly ( I also fixed a pretty big goof on my part, I forgot to pay for the load out on the chimeras.) This is now kind of what I'm thinking. I couldn't afford Chimeras for the Infantry squads, so I dropped 4 of them and spent some extra points on a squadron of Basilisks. I also did change to the Brigade sized detachment to take those extra command points. Do "Gets Hot" rules still happen in the standard firing mode for plasma cannons?
HQ 3/5 *3 Compulsory
Company Commander: Bolt Pistol, Power Sword (35 pts
Company Commander: Bolt Pistol, Power Sword (35 pts
Company Commander: Bolt Pistol, Power Sword (35 pts
Troops 6/12 *6 Compulsory
Conscripts: 30 conscripts (90 pts
Conscripts: 30 conscripts (90 pts
Infantry Squad: Power Sword, Plasma Gun (51 pts
Infantry Squad: Power Sword, Plasma Gun (51 pts
Infantry Squad: Power Sword, Plasma Gun (51 pts
Infantry Squad: Power Sword, Plasma Gun (51 pts
Elites 5/8 *3 Compulsory
Command Squad: Melta Gun x2 (48 pts
Command Squad: Melta Gun x2 (48 pts
Command Squad: Plasma Gun x (38 pts
Commissar: Bolt Pistol, Power Sword (35 pts
Commissar: Bolt Pistol, Power Sword (35 pts
Astropath: Las Pistol, Telepathica Stave (21 pts
Fast Attach 3/5 3* Compulsory
Armoured Sentinel: Plasma Cannon, Sentinel Chainsaw (57 pts
Armoured Sentinel: Plasma Cannon, Sentinel Chainsaw (57 pts
Armoured Sentinel: Plasma Cannon, Sentinel Chainsaw (57 pts
Heavy Support 4/5 *3 Compulsory
Leman Russ Battle Tanks: Battle Cannon, Heavy Stubber, Heavy Bolter (166 pts
Leman Russ Battle Tanks: Battle Cannon, Heavy Stubber, Heavy Bolter (166 pts
Leman Russ Battle Tanks: Battle Cannon, Heavy Stubber, Heavy Bolter (166 pts
Basilisk Squad: +2 Basilisks, Earthshaker Cannons x3, Heavy Bolter x3 (324 pts
Flyers 0/2
Dedicated Transports:
Chimera: Multi-Laser, Lasgun Array x2, heavy bolter, heavy stubber (97 pts
Chimera: Multi-Laser, Lasgun Array x2, heavy bolter, heavy stubber (97 pts
Chimera: Multi-Laser, Lasgun Array x2, heavy bolter, heavy stubber (97 pts
Total Points: 1998