All right-hand weapons are magnetized and, to a degree, interchangeable. Three of the Knight configurations are possible. (To configure the Desecrator, the Reaper Chainsword will have to be replaced with the Warpstrike Claw.) The Nurgle-infected left “arm” is magnetized to the body and three left-side weapons are magnetized to the “arm”. The Smokestacks and Shoulder Pauldrons are magnetized to facilitate the removal of the Carapace to change/connect the battery, which is connected to an LED eye.  I built the legs with the Balemace (tail) pelvis. Only the Abominant configuration uses the tail. It occurs to me; maybe I could have built the standard pelvis and magnetize the tail. Next time.