Thanks! the foot is just built from styrene. Almost didn't bother with it since it's just a swap mini.
Zac, I'm not building entire models because I'm lazy and have far too much other stuff to paint up to bother.
I have ideas far into the future for honor guard stuff....
The chapter swap is a thing on bolter and chainsword each year people sign up with chapters they've created. After the deadline the everyone is assigned someone elses chapter to paint a single model for. After that it's really up to the painter what they do. I tend to use these things to test out new techniques or to practice conversions or do stuff I'd normally never put on my own marines. That's why this guy has the banner and so many purity seals.
IIRC the fluff behind this chapter is they are pretty closely attached the the admech and like bionics so that;s what he got. It's also why I'm debating the old style weapons.