I am constructing a foldarap and using the extruder mount for J-Head in the source. This J-Head adapter appears to align with an earlier X Carriage. Is there an alternative hole configuration in the current XSlider and HotEnd Mount? I can just drill some holes, but wondered if someone has an updated J-Head or Mounting Plate?

which X-carriage are you using? The one that runs on two cylindrical rails, or on a single aluminium extrusion?

I think the one in sources is designed for foldarap 1.0 and 1.1 (same X-carriage as far as I can tell)

Excellent question. I am using the aluminum extrusion X-carriage. I surmised the J-head mount was for the earlier 1 and 1.1. At this point I am going to just drill the holes. Easier than redesigning the mount myself.