"Theo" wrote in message
...
George Miles wrote:
I thought of building a directional frame using aluminium scaffold but
thought it not worth the time and expense, looking forward to more
knowledgeable replies to this post before the trolls take over !

I wonder if you could do adjustable tilt with the panels having a fixed
pivot at the bottom,

That isnt what needs to vary the most, it’s the horizontal that varys the
most, not the vertical.

and then a motor on a screw mechanism to wind the top up and down,
a bit like a screwjack window opener. Wouldn't be that complicated,
although weather and windproofing it might be annoying.