Hi,
I've started closing off the bottom of the car.

Next I'll have to give some thought to adding some "landing skids/pads" somewhere. I have a couple different ideas on how to proceed but I'm not fully sure yet which way to go.
One thought is to do "open" landing skids like on a Huey Helicopter. This could either be a single skid along each side, or a smaller pair forward and a smaller pair aft (kind of replacing the wheels from the original kit).

Another thought would be something similar but fully enclosed, like they have on the bottom on some air cushion vehicles, like shown in this image of the bottom of a plastic model (from Trunmpeter) of the US Navy's LCAC hovercraft. (The small ridges along the bottom are structural stifferners while the four big shapes fore and aft near the outer edges are large closed aluminum shapes that support the craft when it is "off cushion").

Pat