Thanks for the kind words. I should say I only built that site to test whether WordPress was suitable for another application, and I couldn't think of anything else to base it on.
I think the 1994 Kilauea has identical seat tube, seat stay and chainstay to the 94 Explosif. The big difference is obviously the Tange Prestige Concept top and down tubes that were used on the Explosif from 1990-92, and then on the Kilauea from 1993-95. Concept is an ovalised and tapered tube going from 27 x 30 at the back to 30 x 34 at the front, the top and down tubes being the same size and gauge (9-6-9). This is a different philosophy to the Explosif, where the strength/stiffness is hugely biased towards the down tube (31.8 x 10-7-10, whereas the top tube is a 28.6 x 9-5-9). I believe the Explosif is c90g lighter, which is not a lot, but it isn't clear to me where that comes from. Maybe they could use a lighter head tube as there is so much strength in the down tube. Both tubesets are the same material. All Tange Prestige grades are heat-treated 4130.
I can't really compare my 95 Kilauea to be honest because I have only run it with the P2. It's a very fast bike, but my impressions are governed so much by the fork that it's difficult to say how it compares to the Explosif. As far as I'm aware the 95 Kilauea is technically the same as your 94. It's c50g heavier, but I suspect that's actually down to the paint finish, as the pearlescent paint has a really thick clear coat over it.