No. For head you can look at my topic for 470 tripod, for legs all my review is on top - I just don't know that you can write about legs. Legs also have slight problems with Manfrotto heads (Manfrotto heads use large bottom locker, so tend to become vertical after tightening).
It is custom tripod mix made specially for us.
I have such set myself and like it in all aspects. But I am in no way professional tripod tester :-)
They are close, weifeng one being 100x9.5x48.5 . But I doubt that they are compatible, you can look at 3d model of weifeng QR in the design topic and compare.
Looks like a sweet deal, and gear looks great too. Coincidentally I was surfing the Weifeng website last night checking out this fluid head - but what do you mean by 'modified version' how does it differ from the standard head?