It's a 1DIN space, if what they're offering is not good enough in stock, and the option is too expensive; go to a local car audio shop and have them install something that fits your need and budget.Last time I checked, the CD player option didn't seem to be available yet. Plus the options they did have for the stereo were ones that I had no interest in because of cost. Swapping out of standard AM/FM stereo for a combo AM/FM CD player stereo shouldn't be that hard or expensive.
Why do they have to have a special design for the Elio? Because the ends of the 1DIN slot are curved? That's not a problem for any competent Audio shop; you trim the hole to the shape you need, and slide the unit in. Problem solved. If anything, you can trim the hole, and if any part of that opening extends beyond the edges or the stereo, you use an adapter plate to fill it.Unless they design one that only fits the Elio like they did for the C2 generation Corvettes. Replacing one of those is not cheap.
If you look further into the options available, that "special" trim panels that you can order can be color coordinated, wood, CF, or metal; those are panels that are put in over the stock dash; I doubt if they cover what is already there. They have removable panels that get covered, and attach over the dash; so modifying one of those panels is a breeze.