They're not, trust me on that. Not the versions presented in this thread. I actually had a run through GTN to see the green/blue/purple pieces. None of the sets i shown is available from Synthweaving (for a Jedi, don't have an Imperial synth so now I can't tell).
Run through a character that actually is a Synthweaver. I'm telling you, some of these sets are in there. No one bothers selling them on the GTN because no one buys them. So, you can't just go off what is listed there.
Also, remember the armors look different for the opposing faction.
And even so, it doesn't really matter because I agree, I would also like to see modable versions of these added to the game.