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I have to admit that the "Apocrypha of Skaros" name confused me for years

I make no apologies for the fact that other people don't read the codices as closely as I do. Dammit, six point font builds character!
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- No Titans, Thunderbolts or Marauders. Replaced by Storm Talons and Thunderhawk configs.
Sure. Though I think the Storm Eagle would make a good Marauder replacement.
Too much goddamn Storminess in modern Marine names.

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- Thunderfire cannons, probably as upgrades to Tactical Marines. Could make a very solid garrison formation.
They might make more sense with Devastators, or as an independent formation - they're fairly long-range fire support, after all.
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- Scouts get Land Speeder Storms instead of Rhinos.
Personally, I always have despised upgrades that exist only for one unit.
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- Ironclad Dreadnoughts. Maybe a dedicated Dreadnought formation?
I wouldn't bother with the first (it feels like one of those "non-represented variant" things. Like Veterans or Scout Bikes or Assault Terminators). Dedicated Dreadnought formations aren't completely out-of-keeping with the fluff (at least one Ultramarines company has four Dreadnoughts), but they aren't exactly normal, either.
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- Land Raider Redeemer (let the Black Templars keep their Crusaders - 3 Land Raider variants in one list is overkill anyway)
OK.
Like others (and you) have said, waiting for the 6e codex probably makes a lot of sense.