Does not look too bad..., I just forgot something.
Three points:
1) Are you on jessie for raspbian, I am just wondering since the vchost_config error, I think should be gone long ago...
2) I just forgot, you have to create a source tar in order, that debian is happy. You can do this with create_source_tar script in the debian directory, but you may have to adjust the version number in the script. This is the cause for the error you get in the end.
3) Your questions: "One last question: why do I compile vompclient 0.4.2-1 and not 0.4.1?
Does vompclient 0.4.2 fit to vompserver 0.4.1?
"
Well the scraper branch will eventually be 0.4.2 at some time. And only in this branch fixes for compiling in jessie are included.
And yes you need also the scraper branch on the server. But I think the additional work will pay off, since the scraper support branch gives you a nicer UI and if you have epgd and the scraper plugins installed you even get moviepictures.....
Marten