Naah, i dont think screen is needed. 3 rgb leds should be enough. Costs nothing.But it works on PC also aready.
Ok then... we can always add an LCD later if we need to. Better to start with just the wifi chip and a SD card. What SD reader and card have you used with teensy in the past? I'll go ahead and buy the stuff and begin tinkering.
Are you being serious? Because fire hazard aside, that's not a horrible idea.