S13 front swaps have been done in other build threads on here if you look. And I don't mean just swapping the coilovers with a weld-in threaded collar.
The problem with those swaps (and likely this one) is that none of them adjust the changes in Ackerman by switching the knuckles from a rack behind the axle to a rack in front of the axle. Obviously unless the project involved swapping a rear mounted rack also. One build thread did extensive modification to the knuckle to correct the Ackerman.
As was pointed out, such a swap can offer many potential benefits down the road. This kit uses different brakes, but Z32 aluminum calipers, vented rotors, and 5 lug swaps are bolt on for these or S14 spindles.