I'm really not into sun roofs myself, but there seems to be a lot of people on the forum who are.
AChinn, I think you've come up with the ideal way of installing them on the Crossfire.
They don't sever the Crossfires spine, because of their compact size, storage would be simple, and they even look pretty cool. Sort of like the aftermarket glass T-Tops that were available on the C3 Vettes. (Greenwood design) So it would give the Crossfire an even more "retro" look than it already has. If they were hinged in the middle, they would also give a Crossfire a Mercedes "Gull Wing" persona.
Plus the cars structural integrity wouldn't be compromised either.
Personally, if I was one of those people who really want a Sun Roof, I think this would be the very best way to go.
Great idea AChinn