Nice conversion and thanks for the flowers!
i let the guides float in the printed chassis. if i would want to fix them, i found some M1.4 screws at conrad. drill a 1.2mm hole in the guides and directly screw the screw in. with a small washer, the guide is fixed.
been standing in front of my workbench today, i recognized that there are the same things lying on it for the last 4 weeks ... :/