What depth of cut, speed, feed, stepover was that? Looks like you took it very gently. Seems a bit of a random place to choose to cut it within the aluminium sheet, but I guess you had your reasons.

I see you're very generous with the cutting fluid!

Finished part looks nice, are there any marks in the corners due to backlash. Were you using G64? I think so, but it's difficult to tell in the videos.