The hair seals are a bit of an overkill even for the 40k universe. But, otherwise that's some very original idea, never seen such a thing The halo is kinda cool but oversized, usually the halos like this are roughly twice smaller, but once again it's an interesting concept and design if you will 9,5 out of 10 imho!
In the grim darkness of the grim dark far future of grim dark, there is no such thing as overkill. No halo is too oversized, no purity seal placement too ridiculous, no sword too overcompensatory. And that is why we love it.