Thanks for the advice! Here's the tweaked one:
Company command squad
vox caster, Regimental standard, Medipack
carapace armor, camo gear (Commander)
carapace armor, camo gear (Veterans)
Master of ordinance + Commisar - 170
Platoon command squad w/ vox caster, flamer, autocannon - 50
+ Infantry squad w/ vox caster, flamer and autocannon - 65
+ Infantry squad w/ vox caster, flamer and lascannon - 75
Platoon command squad w/ vox caster, flamer, autocannon - 50
+ Infantry squad w/ vox caster, grenade launcher and missile launcher - 70
+ Infantry squad w/ vox caster, grenade launcher and missile launcher - 70
Wyvern suppression tank - 65
Leman Russ battle tank - 150
Aegis defence line - 50
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Veteran squad w/ 3 meltaguns - 90
+ Chimera w/heavy flamers - 65
Veteran squad w/ 3 plasma guns - 105
+ Chimera w/heavy flamers - 65
1 Hellhound w/ Multi melta - 135
30 Conscripts + Ministorum Priest - 115
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1 Vendetta gunship - 170
3 Scout Sentinels - 105
4 Ratlings - 40
4 Ratlings - 40
1) I've decided to use a Regimental standard + medi pack instead of the heavy weapon for increased durability of the squad. The commisar with them is more fluff than anything.
2) Incorporated the heavy weapons into the squads. I know it's better to have more of the same weapons, but I realised I forgot the bread and butter of city fights - missile launchers! So they're in now.
3) I've actually thought about the Demolisher even before, but I find that it's so damn hillarious with that tiny barell. So I'm gonna stick to the battle tank until I can usually see how it works (which will probably be a year or too, seeing as how I'll have to buy and paint all of these

)
4) Got rid of the Veteran and Chimera upgrades and gave the more/more focused weapons. The Hellhound was a great idea, I don't know how it didn't occur to me. And yeah, the conscript blob is in.
5) Added the Vendetta just in case (plus yay fluff!), downgraded the sentinels and split the Ratlings into 2 squads, to make them more believable as small special ops sniper squads running around town.
I so wanna do a Conscript conversion from about 10 different sets, making them resemble the Vervunhive scratch companies. Some from the Wargames Factory zombie survivor range, some different Guardsmen armies, Adeptus Arbites, a few hive gangers... That's be amazing.