Lookin' good - As I have mentioned before, I bought a welder and learned how to (sorta) weld whist rebuilding the deck for my G5200. I even welded re-rod around the base of the deck for stiffness. (in that groove along the back wrapping it around the left end.)
The first thing I noted when removing my mowdeck was the WEIGHT is about double that of a 'typical' riding mower. It takes 2 grown men to heft the Kubota deck onto sawhorses.
Unfortunately, now several years later, I noticed some more pinholes in my mowdeck the other day.
It is sad that Kubota chose to use poorly recycled steel to fabricate these mowdecks. I know a fella who bought a G5200 BRAND NEW back in the day and had to replace the deck (due to rust).... the 2nd deck also rusted into oblivion. (Now he uses a green mower)