I'm not an expert and I normally don't run extremely competitive lists but I also have a pure tempestus scions list so I will give my thoughts.
3 Punishers and 6 taurox with battle cannons seems like a bit too much dakka to me. Normally I run 6-8 taruox and half of them have the missile launcher and the other half the battle cannon. Im not sure if these 6 meltaguns will be enough to deal with the really big and high toughness things. Also, I might be wrong and maybe I did not get what do you mean by having them as Catachan or Cadian but I would say that if you include those Leman russ I thing youll loose your regimental doctrine since I won't be anymore a pure scions detachment (I personally like fluffy and purely scions, this is up to you).
Also, Im not a big fan of the command squds. I would personally just run 1 or 2. I will drop one of your squads and then one can go full plasma and the other full melta. This way you may have a full 10 man squad with 4 plasma and 2 full 10 man squad with 4 meltas. If you have the points, I would try to have another 10 man squad.
Im not convinced by having a third tempestor prime. Displaying two tempestors prime with the command squad (aka "suiciade squds") it seems to me like a really big investment for troops that will just last a turn. I would drop the one with the power fist, dont see any advantage of having a "combat" tempestor prime, and deploy my two tempestors with the big scions squads, I wouldnt bother too much with the command squads, to me they are just there to cover very specific needs but buffing them wont win you the game.
Overall to me your list seems really strong. Hopefully that helps.
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