FS: my mint coupe *PICSSSSS*

I just have a couple of questions -
1 - why then is there underbody rust in all the underbody pics? can you provide more underbody pictures?
2 - why did the head gasket go after only 38,000km? They don’t do that - so the answer “I don’t know” won’t cut it
3 - how does the engine car as a whole run now? was the engine rebuilt? a new one swapped?