not sure if this is the right forum to ask this, but here goes:

does anyone know of any attempt/conversion notes to use the WH40K rule-set (DH, RT, DW, BC, OW) to play in the Old World?

I was a great fan of WFRP 2nd ed., and I would love an "update" of those rules.

thanks in advance!

Not exactly what you asked for but I courage you to check out Zweihänder.