
Here's mine;
Still a
WIP, he has no shoulder pads in that pic, and his cloak is seperate.
Its made from parts off the Deathwing Command box, and the Dark Angels Upgrade Sprue that comes with ravenwing battleforces. And a Chaos Marine Head.
When I made mine, I looked to the crozius's that
GW make, and they dont have the power pack part that you've left on.
As for making it swappable, How about magnetised arms?
Could you whip up a 2nd right arm, that holds your relic option? Or even both arms, although crux pads are an issue for the left arm usually.