Stairs framework

Since the stairs are made from thin material, they need an internal frame.  I could have made them from the steel floor plate, but then I couldn't bend them up myself, and since they are a tricky shape it would have been expensive.  Plus the aluminium looks damn good!

So these are the internal frames.  I haven't quite finished them yet (ran out of bar and welding wire) but they are nice and strong which is great.  The reason for the 'gap' will become apparent later on.