After the Core XY implementation of Ashtar C I pondered on changing the kinematic to a more classic approach to separate X and Y axis motors, but otherwise keep the setup and frame, hence Ashtar D:
Draft
X motor mount with Y carriage 
X carriage with hotend and X motor mount 
X carriage with hotend and X motor mount 
Y motor mount 
Y carriage and Y motor with shaft extender 
Y motor with shaft extender
Again using 500mm alu profiles, utilizing the frame itself as rails:
- 1 V-slot beam for X axis with V-carriage/module (triangle shaped carriage) as X carriage with hotend
- 2 V-slot beams for Y axis, 2 V-carriages/modules with the X beams on it
- using classic V wheels
- 14 T-slot beams for the rest of the frame
- Z bed: white 7.3mm thick Delrin wheels on T-slots
T-Slot 2020 
V-Slot 2020 
V wheel 
V modules with different kind of wheels.
The target is again a 400x400mm printbed, probably 380x400x380mm build volume alike with Ashtar C (Core XY), perhaps a bit less X-wise due the more complex pieces to mount the X motor and pulleys.
More high resolution renderings:
Ashtar D: top view 
Ashtar D: Closeup X carriage with hotend and Y carriage 
Ashtar D: tilted top vew 
Ashtar D: Cubic Frame, Head XY, Bed Z
The project page on Ashtar D summarizes the current state of the project.
