Next we need a DIY handheld to go with this. I don't mean something like the 3D printed handhelds getting around, I mean something people could make themselves

Next we need a DIY handheld to go with this. I don't mean something like the 3D printed handhelds getting around, I mean something people could make themselves with only basic soldering skills. I just discovered the Odroid-W, a very tiny Raspberry Pi clone. Surely one could sneak that into a PSP housing easily.