Some of the mods aren't bad. Others aren't to my taste, but the guy's in business and presumably makes customers happy.
The Westinghouse range in the first pic looks good, for instance. Looks like it just has modern burners on it.
I have mixed feelings about new compressors in old fridges. The old tech is part of their charm, but its hard to say how much life they have in them.
You know somebody is going to do a websearch, find the caption saying he can resell Kelvy Foodaramas for $8000 to $10,000, and try to sell a rusting hulk for that much!