One of the last remaining parts was Y carriage assembly. I decided to cut the frame from 3-4 mm thick aluminum, should be light enough not to make the difference on carriage weight, while being quite stiff. This is what I came up with:

Aluminum Y carriage design

Aluminum Y carriage design

As for cutting, I visited a company operating a waterjet cnc cutter Рamazing stuff! Take a peek how it went :)