I didn't say it's hard anywhere, did I?

I just think it's a lot of work and if XMP is working on a new/improved engine, then it might be a waste of time cause things might change.
Not sure the animations are the same for all the chars? I mean, there is a chance the same animations will work for slight changes in rigging, but if thats changed, animations like using the machine, stocks etc would need touching up at the very least or not?
With skin I meant the texture, with physics I meant the transforms for breasts, vagina etc. (I actually think there should be a transform for the vagina in the sources, but there isn't)
Also fluids. Blush textures. Code changes is work, too.
I mean, it's all possible per se, but a lot of work. It would be great if somebody did it though.