I'm curious, when I searched 'birdy' I only got Decode.
http://animesuki.com/series.php/1258.html and 02.
There was a Tetsuwan Birdy 4 ep OVA in the 90s, is it licensed, or would it be okay to host on a tracker? Since that's probably what some might want to watch first and if it is available, might interest people in purchasing the Decode sequels.