These are photos before the vehicle was painted, but below I've replied with current photos.
The model is almost fully painted, but is pretty much ready to show its face at any table.
This is a Raider kitbashed with a Cauldron of Blood, Dais of Destruction, Kabalites, and some bitz odds and ends.
The dais uses many of the arches from the Cauldron of Blood kit, and leaves behind the throne itself. The stairwell fits nearly perfectly with the Raider as is. Kabalites use Wych legs for added dynamism, but there are some good legs in the Kabalite kit that are dynamic and can work for this as well.
An old metal vulture...I think a Tomb Kings model, will serve as the hood ornament. The helmsman uses a Scourge head and a Hellion hellglaive, and previously served as a converted Incubus.
A Mandrake model has been sawed in half to appear to be emerging from the portal