By point:
No, they are not commercial products nor with further research, can much more about "Red Eye Arms" be found, except that they are supposedly working on a ceramic barreled grenade launcher now.
So I don't think this is a very good source.
Second, wood probably would not work, since I doubt that it could stand the forces a bullet is normally subjected to.
Third, there is no argument about the possibilities of caseless ammunition, but it is irrelevent to this discussion. There is next to no possibility that a manufacturer will make caseless ammunition with a non metallic bullet. Why? No reason to.
Forth, of course homemade guns can be made, that isn't the issue. But you are making the connection between homemade guns (which as I recall is illegal anyway) and non-detectable plastic guns which, while theorectically possible, require advanced plastics and ceramics and the machining of them, which make them a practical non-issue, especially for terrorists.