Thanks skytrain,
Yes, it was the swept tail and the exhaust that seemed different in all the Tazarv photos and Wiki cited the two I mentioned as the earlier developments that led to the Tazarv, but I couldn't find any photos.
I see that LM was about earlier and if he's not now in class he will no doubt put up my 031.
Edited to say that LM's light is out now, so I guess that he probably is in class for an hour or so. Therefore, as ther's a few regulars on line, I'll call Open House now so that we can keep it rolling, my coffee break's over now anyway.
Go for it guys