Are Red Scorpions from an Imperial Armory book? I guess their tac squads get Apothecaries? Do they replace the Sergeants?
Against orcs, 100% thunderhammers seem a waste. In a Landraider squad with a Independent Character, I'll typically have 4 LC's and 3 TH/SS. This gives you a few guys to soak up AP1/2 hits with their SS, but still keep your init high enough to tear through orks before they attack.
Lightning claws will go on Init 4, have 4 attacks on the charge, and will reroll wounds.
Thunderhammers will go on init 1, get 3 swings on the charge, but will cause instant death (which is great for Nobs and FNP units).
Now, for their ride. I am a huge fan of the LR Crusader. When it moves 6", it can fire the Assault Cannon and both hurricane bolters AND use PotMS to fire a multimelta. Hurricane bolters will eat up orks. Assault Cannons can crack open truks, rhinos, and other transports. So can Multimeltas, for that matter.
LR Redeemers look great on paper. However, if you move them 6", you'll only get to shoot 1 weapon AND an additional with PotMS. While a S6/Ap3 flamer will destroy a unit of marines in cover, the range is limited. It's very tempting to take, and understandable. But I haven't had any luck with it.
You will be tying up a ton of points on this unit, though. What will having a Librarian run with these guys give you? That's the question you need to answer. Would you rather put the Librarian with another unit to have 2 decent units, or would you rather just have the one kick-ass unit? Choices, choices...
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