Interesting. And, once more, proof that studded right shoulders are just as canon as left ones.
But the only really unique bit is the helmet. I may have to work out a way to convert/scratchbuild something like that.
Oh, and the cross-shaped cutouts just remind me of Black Templars. Or Grey Knights.
And, yeah, planned to be a big army. Well, maybe big by accident. Just kept choosing chapters I like. But the idea would be that no chapter can be used as an army on its own, so none would have BOTH an HQ AND 2 Troops choices.
The plan on size is that it would be a 'Zen' army. It's one with everything And multiple choices of anything a) I like or b) is common according to the Codex.