I agree, the last thing you want is to have cracks always appearing where you cut and frankensteined your lip back together. That piece takes a serious amount of abuse being at the front/bottom of your car. My car isn't lowered and I still scrape it on steep inclines occasionally. I opted for a polyurethane imitation STi V-Limited lip for my car because it was inexpensive and it won't crack like a fiberglass lip would. So far, it's held up pretty well for almost 40,000 miles/2 years.
07 WRX (Albins 5MT + Blouch 20G)
Jorge Carrillo Tuned (365 whp/340 wtq)