They still make them:
http://www.morgan3wheeler.co.uk/home.html
A review:
http://www.motortrend.com/roadtests/convertibles/1208_2013_morgan_3_wheeler_first_drive/
According to the Wikipedia page, they have a US spec model, too.
Had never seen the Morgan 3. I looked at your link. It has a single rear wheel and the weight distribution is forward. It is possible that it might actually skid without turning over.
The 3D printed car has a single front wheel and I would never ride in one. Not safe.