Messages

That's some sort of crash inside the clipboard routines, probably some sort of bug related to teh WINE clipboard implementation. I don't think there's anything I can do about that.

Yes there is - you can report a bug at bugs.winehq.org  Don't forget to specify which versions of wine
are affected, and how to reproduce.

Nice guide!  But you could simplify it a bit by using winetricks to install gdiplus and comctl32, e.g.
  winetricks gdiplus comctl32
No need to run winecfg, winetricks does that for you, more or less.
Also, winetricks vcrun2008 already installs vcrun2008sp1, so no need to be specific.
So steps 3 and 4, plus some later tips, can be more simply stated as
  winetricks dotnet20 vcrun2008 gdiplus comctl32

Section 2 of your "build custom wine" guide links to
  http://bugs.winehq.org/show_bug.cgi?id=14882i
(see the extra i?)  Please remove the stray char.

I'll try to poke the Wine developers to see if they can fix 14882 in trunk.

It would be helpful if you could create an entry for AGS in appdb.winehq.org.