Consider
www.cudaspoilerguy.com (Jon) as he makes the fiberglass replica T/A and AAR race spoilers.. he's located in southern Calif. I recently ordered 5 Challenger spoilers from him (sharing the freight costs with other local buyers here in the Chicago/midwest area brings the cost down).
I, too, am concerned of breakage, but I'll take that risk. My factory ABS plastic T/A spoilers have taken hard hits from pylons, etc, over the past 35+ years of autocrossing and street driving... they still are a-ok.
Also consider:
1. The split factory T/A spoilers aren't that effective in actual function; a wider and deeper/lower spoiler will offer downforce at hi-speeds (~70+ mph), such as road course lapping events, etc.
2. A full-width spoiler takes away the ease of sliding your floor jack underneath the k-frame. The split T/A spoilers are shallow, and with the split opening, the jack handle fits right between the them allowing you to pump the jack; a full-width spoiler won't allow that pumping as easily unless you've got the car elevated or sitting high to begin with.
3. When I eventualy install my full-width spoiler, I'll use another valence panel and may also attach some brace supports underneath, such as the way Brad did his... he did a great job making his overall unit!... and yes, he should consider selling them to cover some of the costs for future race events, etc!
4. I'm considering to have a ~12"-15" center removable section (maybe hinged or pinned) so to allow the floor jack to easily slide underneath and pump the handle as well.
5. I like to differentiate my Challenger from all the others. I'm a fan of the vintage TransAm cars and their heritage... so, the full-width front spoiler will speak for itself. I intend to cut my brake cooling openings in the spoiler so to fit my exact air ducts as i want them.
6. Its possible that you can take 2-sets of T/A split spoilers and widen them towards the fenders... cut/blend/epoxy and heat shape them around the turn signals... and you'd have a better/wider factory split spoiler still with the center opening for the floor jacj, as well as reasonble ground clearance.
7. You can get low-cost air ducts and incorporate them into the T/A split spoilers (or any spoilers, for that matter) by using the typical shop-vac floor ends (Craftsman, Home Depot, etc).
8. You probably know that the current 2008-up Challenger front spoilers can be made-to-fit onto our cars... past thread has details.... pretty slick and sharp idea!
The picture of the black Challenger... is that front spoiler an actual model FOR the Challenger from Randy's? It looks pretty good, but easily damaged... yet more funtional as well.
Good luck with your decision!