I ordered the blue Impul Z pictured above... $20.15 shipped. I am planning to mount it using foam and lego.

I am going to cut out a piece of foam from one of my old Tamiya 1/10 car foam bumpers. Put it in the front and mount like how Mini Z bodies mount. And for the sides, I will try to use the round lego pieces. I will have to trim it to fit in the holes on the chassis.
I searched japanese sites using Online translators to search for phrases like "mount bandai dnano" but I could not find any instructions.