I'm not sure I'd necessarily require anything more than the basic flesh and bone craft powers; but I'd definitely require lots of high difficulty rolls and successes just to properly create such a beast without killing it. After that, there would be a copious amount of rolls and successes required to train the thing to even use it's new body format.
Failures in the creation phase would outright kill the unfortunate subject; insufficient successes could render it extremely weak (strengh or stamina-wise), or introduce muscle spasms or partial paralysis (effecting dexterity), or reverse the progress of previous rolls.
Once the physical transformation was complete; training would be required to teach it how to walk again, to use it's new appendages, and possibly just to prevent the thing from attempting to kill itself the first chance it gets. Successes also determining final effective dexterity, strength, and willpower (if applicable).
While I said at the beginning it would only require 3 dots in Vicissitude; the real demands would be high levels of basic stats involved. Medicine, Biology, Mechanical Engineering skills paired with Intelligence and Dexterity attributes would be necessary for the creation; and Animal Training (along with maybe some actual levels in Animalism) would be the least needed after the change.
This is something that should probably be roleplayed through to "find" the skill checks. If the creator doesn't paralyze the subject as a precaution before certain stages, convulsions or thrashing could kill it... but then they might fail trying to undo that paralyzing later.
When the creator starts building the wings, where are they going to take the muscle from? Basic Vicissitude allows rearranging things, higher levels might be need to transform mass, and are definitely need to transplant. If bones are hollowed out, will the creature become more blood dependent?
Will the creator succeed, ultimately to have only created an utterly broken and useless thing. Needless to say, if the character was on the path of Humanity before, they certainly will not be after the process has finished.