You just figure out where you need stuff and we will make something work.
A note with the back mounted speaker option though, I have that set up for a 6.5" speaker and the distance to the edge of the panel shown in the pics is as close as it can get.
I need a few inches around the speaker for the frame that the speaker gets mounted to.
If you were cutting a hole that large it would basically need to be within the area that the biggest cargo door covers, that would make it so the back of the panel can have adequate bracing to support the speaker.
And for the evap tubes, I really don't have any better pics than those, IndianDoc posted up the nice ones starting on the bottom of the page
here.
It literally just has the fuel lines extended a little bit and it is stuck in the back corner, nothing else complicated about it.