As someone who didn't do any of the lifting but just stood there, mouth agape, my impressions were these:

On both days, it was the last bit that mattered. Gordon had two things to prove - day one - that stonerowing worked, and day two - that a stone could be elevated quickly and efficiently by a small team. In both cases he was completely vindicated.

Most of day one was spent messing about (a lot of it was used by the heavy hauliers using their crane to put the thing on the ground!). A lot of time was then taken up getting the variables right - which levers, how long, which fulcrum, how many people etc. Towards the end of the day we'd figured a lot of it out and now know enough to iron everything out for next time. And it DOES work, like a dream. We now know that for sure because the few strokes we managed at the end, even without the optimum levers, were really smooth. It's an extraordinary site to see 12 tons rise up and move forward through the air and then settle gently a foot forward from where it was. I wonder who last saw it done?

Day two was also mostly spent learning. One of the major problems was the slope of the ground. It was vital that the stone was supported dead level so it wan't until lunchtime that enough adjustments had been made. (Next time, obviously, will be on level ground). Once that had been done and uniform logs could be inserted progress accelerated and the last two complete "lifts" of the level of the towers took only about half an hour. This is hugely significant as it shows that if the time hadn't run out the stone could then have been elevated to any height required and the towers would have remained perfectly stable. Bear in mind, the stone weighed as much as the Stonehenge trilithon lintels and not far off twice the weight of the outer circle lintels!

So in both cases, it's no longer a case of "can he" but "he has"! Huge congratulations to Gordon!