As I had said, WeatherTech makes a great product; what I left out is that they charge accordingly.They really do look good. Do you suppose they could make one that fills the whole floor as far back as the rise to the passenger seat? (Buy you might have to take the driver's seat out to install them). If that's not feasible, you'd have to drill a pair of holes and put retainers in through the floor pan of the Elio -- carefully, because who knows what's running where under there. I hope Elio decides to go with them as an official option supplier.
Their mats and cargo covers are expensive; I imagine the custom ones follow that same pricing rule.