Every think is nicely done, but don't leave bearings closed when they work inside oil bath, take out those side covers! That way they gonna last much longer and will be oiled and cooled by transmission oil.
Nice video. Now you will have faster gears. Oh, and regardig mtz 50 parts... You will have problems with front axil, if you will repair it, becouse it's older model front axil and there is some parts that no longer sell. I'am not shoure which ones tho.