Outside of the retactable wheels I think I came up with a reasonable mounting scheme. I did have to delete the wheels and axle. Here is what I came up with. Now there is a way of choosing whether to have the wheels or pontoons via a parameter dial. I personally haven't tried so have to locate my notes on the subject and play. Reguardless of what I come up with I couldn't give it away. It would involve using UVMapper Pro to set up the modifications and not everyone has that app so I would perfer sending you the obj file, I believe Carrara reads them, then if you decide it is something worthwhile for your project, feel free to impliment them.

I must remember to remember what it was I had to remember.