you'd want to be sure you have the travel needed with your struts, brake line length might not cut it so you may have to extend those, you would probably have to drop the front axle even more than calmini or boondox brackets do.. not sure if there would be anything else but I was actually thinking I want to turn a calmini 2.5 kit into a 4 inch lift someday. a 5 inch suspension lift would be cool. Might be a bit much for the stock conrtol arms and suspension links you'd still be using with boondox though.. that's the only problem with boondox but they seem like they have a really nice kit for 1st gen vits
but yea, with the propper things done on the side I bet you could make one of those into a 5 inch..