Hey all. Firstly This is my first guard list I've posted so please be nice dakka

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I'm currently in the proccess of forming a siege themed guard army. They would be for friendly games only. I'm not desperate to win games but I don't mind the occasional vicotry, so I'm wondering is this list even functional enough for friendly games? Also I know vendvets aren't Siegey I just love them. Any comments and critisisms will be greatly welcomed (even if they are only minor things to make the list more fluff accurate).
HQ.
CCS [medic, vox, carapice,
MoO, missle launcher, chimera] - 205
Troops.
Platoon 1
PCS [ vox, mortar, 2X melta] -60
Infantry Squad [ vox, missle launcher] - 70
Infantry Squad [ vox, missle launcher] - 70
Infantry Squad [ vox, missle launcher] - 70
Infantry Squad [ vox, missle launcher] - 70
Heavy Weapons Squad [ mortars] - 60
Heavy Weapons Squad [ mortars] - 60
Special Weapons Squad [ 2X flamer, demo pack] - 65
Platoon 2
PCS [ vox, mortar, 2X melta] -60
Infantry Squad [ vox, missle launcher] - 70
Infantry Squad [ vox, missle launcher] - 70
Infantry Squad [ vox, missle launcher] - 70
Infantry Squad [ vox, missle launcher] - 70
Heavy Weapons Squad [ mortars] - 60
Heavy Weapons Squad [ mortars] - 60
Special Weapons Squad [ 2X flamer, demo pack] - 65
Vets [ grenadiers 3X melta] - 130 (will be rollin' in the vendetta)
Fast Attack.
Vendetta - 130
Heavy Support.
Odrdinance Battery [basilisk, basilisk, medusa with bastion breachers] - 390
Manticore - 160
Leman Russ Squadron [leman russ, leman russ with pask and lascannon] - 370
Total - 2435.
I've left 65 points to spare to make changes reccomened by people. And is it just me or do the leman russes not feel right?
Thanks in advance.