Simple conversion idea for making plastic Black Knights for WFB Vampire Counts army.
In fact it is almost pure kit-bashing job with one exception, but later about this.
I'm going to start with Tomb Kings skeleton horsemen by cutting riders in half. Exact place for cutting should be adjusted according to the selected torso.
One can name several possible kind of knightly torsos, which can be useful for these models. I've chosen Dark Elves Corsairs fronts paired with back of VC Grave Guard. First reason is that I have these bits at hand, but additionally I intend to emphasize an undead character of the models by showing (at least a little bit of) skeletal chest incorporated in Grave Guard's body-back. However, this skeletal chest is slightly wider than the hollow in Corsair's front armor plate, and this will require some converting effort (cutting/filing). For this reason, we can call this project a conversion :-)
If you prefer to avoid these front-back mismatch, I suggest to use DE Cold One Knights torsos.
Of course, one can go further and use almost complete DE Knights just swapping their heads and hands. At the moment, I don't know if this will require a big adjustment to legs' position.
As for the heads, I will use Grave Guard winged helmets with addition of one Skeleton Warriors head (down- middle). I thought about using some kind of full helmets (e.g. Bretonian knights) but this would make too large disproportion with spindly skeletal legs of the rider.
Additionally, I want to pimp a little bit the horse heads using some feathers-like ornaments from Empire range. These below are Empire knights bits with exception to the last one (Greatswords feather).
Finally, I will give them some nice shields. Being still undecided which ones I wish to use, I selected these 3 possibilities.
As I'm always short on time, I don't expect to see my models completed soon. So, if you have already built such regiment or have pictures of alternative approach to this problem, you can put a link in the comments.