After few months printing discovered heat made the circular acrylic piece that came with kit, warped and became concave, so pieces were attaching poorly, decided to replace it with a square borosilicate glass (200x213x3mm) plate.
Made this pieces to attach the glass to printer and, by using 2.5mm nuts and bolts, can level base more easily than it was on original design

You will need three pieces of each.
Base has several holes to find the most suitable position, there is no fixed position on glass so choose the most adequate hole that allows screws to be as vertical as possible in order to compensate printing vibration