Seriously awesome thread you got going here! I'm going to keep an eye on this one
That AoS / MK3 Marine Kitbash is looking very good. I've had a relatively similar idea. But instead of using the whole MK3 leg, I will make the cuts on both AoS Blood Warrior and MK3 Marine below the knee and then swap boot for greave. Should involve hopefully less green stuff work. But your Berzerker is 1.5 to 2mm taller than my version then. Where do you get those cables from? I like them a lot, as it gives the Blood Warrior a nice 40k vibe.
Your demonprince is truly going to be a monster! Really looking forward to seeing it built! I've always wondered why Terminator Lords never are granted daemonhood... Maybe that's why Abbaddon hasn't evolved yet
How do you go about sculpting the trim on your contemptor? I've got a leviathan dread sitting here, and I'm a bit unsure how to get started at adding trim...
Keep up the good work!