Teensyduino Fakebuino possible?

Would this even be possible? It says it is compatible with all arduino libraries and software, so it seems doable. I ask because it would be a simple way to have an upgraded, more powerful Gamebuino with 4x ram and I think 3x the power.

Well, it seems the only thing is a bit of porting and modification, am I correct? If I eventually make this, I think I would use a higher resolution OLED display, and probably put it all in the plastic skeleton of a little lcd game thingy like the ones you find in Walmart sometimes. That would give it nice buttons and a sleek look. All this will take place when I have more experience, though. At the moment, I'm using my Teensy for more basic things.