its not hard to steal parts or sections from other cars and mold them into your factory stuff, it just takes time and money.
i once molding the front cover from a 2001? mustang cobra into the rear bumper of a audi. used the outer opening as exhaust ports. wish my computer didn't crash i would still have pictures.
as long as the measurements are close its not terribly difficult. i imagine you could fit the bottom Z24 cavalier front spoiler to your style aveo quite easily, it just "bolts" on but you would need to drill a bunch of shaped holes for it though and possibly section it to narrow it.