I do the handles fatter by using thicker material, I try to get it down to around 3/8" thick before shaping or maybe a touch taller and then contour it down. The stock handles are around 1/4" at the thickest. If you want a longer handle, I can convert it to a Wa style tang and do a Western shaped handle or a Wa shaped handle (Octagon, D or Oval).
Many are out of stock currently; I am working on a bunch more for Mark this week
IIRC, I have a 240mm AEB-L and some 210mm M390's here. Maybe a 210mm in AEB-L, but I'm not sure.
If you already have an Artifex, you can send me the knife and I can rehandle it, or you can have Mark send me the Artifex directly, or wait a week or so until some more go back in stock. Any particular wood you are looking for and blade length? I have some Maple Burl here in Brown, Natural, Black and Blue, Curly Koa, Curly Mango, Sycamore Burl, Claro Walnut Burl, etc. I have a whole box of stabilized woods here waiting!