Disclaimer: I don’t know what I’m talking about, this is all theory and links to other people’s research and ideas. 
From what I’ve read, the mother and father are equally important, or if anything, the father is more important - of course, the father can also be much harder to select for the traits you want (How do you pick your stud? - Overgrow.com). We don’t have much in the way of genome mapping accomplished for cannabis, at least not information publicly available that I’ve found, and I personally have no idea whether any of those traits you listed are recessive or dominant except for the Freakshow’s leaf structure, which I’m fairly sure is recessive and may even be a recessive sex-linked gene (Important Freakshow breeding info. Plus bonus Multileaf mutant info). I have no idea what order would be best, other than knowing that you should probably cross the Freakshow in last since it’s at least recessive, if not recessive sex-linked, and you don’t want to have to select for that in each and every generation through every cross…
Just offhand, based on the crude observation methods I have available to me, I can say that if I were in your shoes I’d try crossing the Power Plant with Purple Diesel, then breed out the cross and pheno hunt for a male and female pairing that both carry the rather obvious selected traits of structure and color… though as for arousal and euphoria, or later on giggles/creativity, all of those are probably going to be terpene-based. Unless you have access to sophisticated testing and more knowledge than I have about any factual basis for the “entourage effect,” which may or may not be real at all, that leaves you with lots and lots of double-blind smoke tests with the F2 and succeeding generations before you stabilize the traits, at which point you can start crossing your first cross with another strain using similar methods. Crossing in for THC is easier, since there are simple (though probably fiendishly expensive) tests for that.
Hopefully at least a little bit of this helped you, rather than just confusing you more. 