That's a beautiful clean black. I agree about the space wolf heads, a lot of them have a good teutonic feel, the Templars seem like they would like a good moustache.
Yes, the new rule for lieutenants is that if you take one, you can take a second without using an HQ slot.
So you can take any 2 lieutenants together now, even 1 primaris and 1 non-primaris.
Those walker crews look great. I've just bought some Novan Elites in the meantime.
How are people finding them to work with? I've seen them on a few titans' bases.