Are we still calling them Guest Race chapters? I thought this was now verbotten.
Anyway, the way that currently unknown named (the current name is a bit too silly for me to mention) Ch. 7 works now, I would say skip bothering with a layout. For that chapter, follow the quests initially, but focus on getting that portal upped, sell all you needed to get there, and Portal Profit to the end. Go as far as you can with the quests while doing this, and then decline them once you open Orcs, whoops, Ch. 8.
Have fun!