hi rhamer,
You build looks great, I would just like to share some of my previous build woes, weight.
When I built my first front end loader for a 22hp Belarus Tractor, I used 4.75mm plate for the bucket wanting heavy duty, I regretted its weight after the build. The manual steering was horrible with undue stress on the front end, also rear ballast was needed to make a lift over 90 kilos. If I do it again, I would use 2mm or 3mm plate, thin walled tubing, placing stiffeners at structural points allowing lighter construction weight. The cutting edge and mount/pivot points is where strength is needed the most.
May I suggest during your construction, consider making the unit easily "Removable and Replaceable". You will find that carrying the weight at unneeded times is unproductive.
All I am trying to say is that my first build was more than twice the weight needed. Probably 3 or 4 times over weight.
Great Work, you will love your loader!
Rhett