Its funny how some days you can do a few hours work and make a lot of visible progress and other days, like today, where there is very little to show for hours of hard work.I anticipated I would have a bit of a challenge with this stage i.e. levelling and squaring the skeleton. The reason is that I have not got a perfectly flat floor to work on, if I had the skeleton would simply have to be lined up on the horizontal, but I have to level it vertically first, and its proving to be a heaache. I spent all of my time today experimenting and thinking the problem through. I think I have a solution and I hope to progress tomorrow. I will post in more detail tomorrow.