Ahh, here in Germany we also got the first CD (from that ghastly magazine with Hans Ippisch…shiver)…my god I played that over and over…I just wish I hadn’t found the sand mites and leveled up like crazy…the full game was easy enough and I continued that save…
One demo I would have loved to see and play was the prototype PDZwei, which had the trench run of Episode 2, very Panzer Dragoon (1)-looking (you can also see it in Omake…#2 I think, in Pandra’s box). It was at some convention back then so I imagine the general public couldn’t get it. 
While PDZ had a much cleaner engine, PD always looked a little more detailed to me. Little things like a full 3d pilot (Zwei had the cardboard cut-out Lundi XD) more distinct textures and effects like shooting at the ground or walls and different resulting explosions. In PDZ they just go through the walls which you can see at certain angles. As I said I would’ve loved to see Episode 2 in the old engine.