[S_Q]

HQ
Master of sanctity with jumppack, terminatorhonours and powerfist=160

If I'm right you're using the pf and the crozius. Good enough i think, both the str 8, i 1 choice or the str 4, i 5 choice. Maybe reconsider using a reclusiarch? That gives you extra points to spend on the rest of your army

Master with Mactercrafted lightning claws, terminator honours, Iron halo and infiltration=163
10 Caommand marines with infiltration, vet sergeant with powerfist, company champion and two meltaguns=250

Your command HQ ccb tooled or range? My personal choice is all bp/ccw instead of bolters.

Elites
Venurabole Dreadnought with twin lasscannon, Missile launcherand tank hunter=165

Good enough, but get extra armour.
But my personal advice, use the ac/dccw/extra armour setup with venerable, FA and a droppod, because you already got enough long range devastation (devastator and the 3 lc squads)

Troops
10 Marines with infiltration vet sergeant with powerfist and meltagun=220
5 Marines with lascannon and tankhunter=105
5 Marines with lascannon and tankhunter=105
5 Marines with lascannon and tankhunter=105

My biggest concern are the 3x 5 men lc squads. They are all 5 men and footslogging. I recommend you to use infiltrate and make them 6 men. A plasmagun is also a recommendation.

Fast attack
10 Assault Marines with vet sergeant with powerfist and two plasma pistols=260

Good

Land speder tornado=80
2 Land speder tornado=160

Remove 1 LST of the squad with 2 LST's, offers you another 80 points and 2 LST's is good enough

Heavy support
8 Devistators with 4 missiles and tank hunter=224

Very good, but expensive. With infiltrate, this squad will be devastating, just an advice.

Fluff wise? I really need to know the backstory of your army to decide if your army is fluffwise

 

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Uhg how the hell do you make a drop pod for a Dreadnought?

droppod may have these contents:

5 terminator or
10 power armour or
1 dreadnought

 

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Fluff based armies would contain squads consisting of variants like 5 till 9 men squads. Men will die and new ones will fill up the gabs. And that will take some time, just like the novel Dark Adeptus. There the GK squad fights under strenght (6 men).

Also, fluff based armies would rather be special/unique then basic. Your 3x 5 men squads are too basic.

 

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So the ultrmarines will never use difrent tactics no matter what the situation or no matter how much sense it make?
If this is true, forget fluff! I dont want to play the same game the same way every time I walk in ot a GW.

Fluff means, your army is based on a story. GW or not GW, if you have a story, and your army is based on it. Then it's fluff based. Unfortunatly the Codex SM is highly ultramarines based and ultramarines is a codex army.

 

[S_Q]

also a possibility:

Use traits and be a successor chapter of the ultramarines

 

[S_Q]

You can use your imagination, by changing the kneepads, shoulderpads, helmets, backpack and like. Paint don't get too thick that fast, unless you paint that thick.. (add some little water )