I can't get the idea out of my head. My old epic forces include a household of Knights built out of 2 companies of Knight Errants, 2 companies of Knight Paladins, 3 oldschool 'crab' knights, 1 company artillary knights. and 2 barons. I love fielding these kickass models. They're high movement and solid armour made them indespensible against any mechanised or Titan enemy. Love 'em

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Nowadays I mainly play
40k but the memory of those badass Knights is overshadowing the building of my burgeoning Ordo Xenos force. Can I scratch build one? What rules would I use? Do I have to field a Mechanicum force to include them. If a knight is only slightly bigger than a dreadnaught, could it be used in games under 3000pts? Or even 2000? Ooooh I'm getting dizzy!
Has anyone used Knights in
40k? Can you answer any of these questions?
Or anything to add regarding the background fluff.