I miss my build, that was half the fun
Yours is definitely looking good so far
How thick is your tubing? I told my welder I wanted 1/8 but got 1/4 instead. I have the same castors you do. Its the only failure point Ive found....for me anyway, the damn thing is just too heavy lol

I do recomend rolling 2" steel strips for retaining rings into the radius of a keg. Best mod Ive done to Lonnies plans