EV4 looks like its built out of mekano pieces but the video is very convincing. The tilting seems to be very well developed an it can handle high speeds well. The name EV4 is short and smart and describes the 4 wheel electric vehicle perfectly.
4 wheels, all with individual disc brakes and dual beltdriven motors in the rear this could outrun and out handle a gokart! They have and extensive image and video gallery and several recent articles on site like techstuff and some other more local sites.
Would be nice to this go intro production but the site is on polish and it does seem to be in prototype mode only. My recommendation, kickstart it!