Base Size Question

I'm building up my Daemon army, and I need to start deciding how I'm going to convert my Heralds of Tzeentch. The question I've been pondering is what size base do I use for a Herald on a chariot. I know several people who have used the Fantasy chariot base, but I'd rather not use square bases. So, my question is, can I use a simple Monstrous Creature base or make something out of 2 of the round scout bike bases? What do y'all think?

I'd just use a 50mm or 60mm, whatever you use for TWC.

Yeah. I'd have no problems if someone had one modeled on a dred base.

I saw a question on another site about this recently. Their conclusion was that since there isn't an official model you can use anything within reason.

I would use a dread base or a Valkyrie flyer base if you didn't want to use a square base.

I'd use a valk base too. Lots of room to work with

Either MC base or Valk Base. I'd prefer the Valk base for aesthetic reasons.

don't Chariots of Tzeentch count as jetbikes? you should be ok following the basing rules for those