Looks great!
I see by the 3rd pic the bucket pivots on arms that are 1/2"x2" ish? When the bucket is flat is it cradled/supported by the rear framework laterally? I can envision the corner of the bucket catching a rock/curb or turning while scooping and putting side pressure on the cutting edge and tweaking those support arms, making them rub in the channels. It very well may be a non-issue under normal use, just curious.
Bill