Sounds like an interesting project. If you got the patience I say go for it.
Its just that if i were to grow a bunch of these, it would most likely mean that i cant grow as much as i want to smoke(i dont have tons of room), and also i prefer more of the indica leaning stuff most of the time. This sort of pure sativas is more like a delicacy i prefer in certain situations.
I did just pollinate one bud of amherst sour diesel with freakshow, and im making more freakshow seeds as well. Also i have cuttings of these and im planning on making feminised freakshow seeds, and also use that feminised pollen on triple g and/or maybe gorilla breath i got coming.
The freakish leaf mutation should not emerge in F1 crosses at all to my current knowledge and only little mutation in F2. But im more after the unique terpenes and likely i will also mix the amherst and gorilla freaks later and see if some funny stuff comes out that would still be relatively normal and make good yields and veg faster than these regular feakshows