Good catch .
Unfortunately, you'll probably find more , stuff , that's not as good as it should be. You might want to consider an over lay, of about 3" with the current weld centered, under the overlay.
I'll , pass this along.
I'm the third owner of my coach. When I had it in for a service the engine controller had 35 codes for turbo over boost, that the shop couldn't really explain, because the check engine light wasn't on.
A month later , changing the oil filter I spotted the problem , the waste gate control hose fitting was broken off the turbo. Removing the broken fitting required turbo removal, waste gate had never opened since new, no carbon in the waste gate by-pass passage, and reveled two holes in the hose as well.
From assembly line damage when the engine was lower into the frame!
3 owners , 52,000 miles, records of multiple trips to service facilities, and I'm the one who found the problem on a ( at that time ) 12 year old unit.