@kraegar The RailCore II 300ZL kit looks amazing and I am definitely saving up for this to be one of my next 3D printer purchase. I also wanted to say that the "Halo" prototype looks good and I wanted to suggest a idea for it. You should expand the Halo exterior profile to add slots for a removable top enclosure made of acrylic or PC. Thought it would be a good addition to the optional upgrades for the kit. I only suggested the profile expansion because from the photo I do not believe the moving components would have proper clearance with the current slots in the design.