Ideas to inspire...
After plenty of research, I chose 4mm polycaronate sheets to enclose the bottom section. This material is tough, doesn't scratch up or deteriorate and provides 99% UV protection.
I was told that I could apply any type of fixing so long as I over-drilled the holes to allow for expansion. Also, I was advised that the fixings could be 600mm apart. However, in real life, the product warped away from the timber frame as it heated up. This surprised the supplier as well. To solve this, it pays to ensure that the fixings are placed no more the 300mm apart.
I also used this same material as glazing for the windows except that these could be 3mm.
It has been several months since this material was installed and what I like most about it is that it also seems to resist dust and other crap sticking to it. It provides a consistent clear view.
The front and back have fixed windows. I built the window boxes (I'm sure there is some technical term for it) into the frame. The glazing just slots in. I ran a bead of sealer on the inside of the outside ledge, pressed the panes into place and used 12mm mitred timber to lock the pane into place.
The windows on the two sides are all hand made. They all have mitred corners and, for something different, are held together with four dowels on each corner. I made a jig from some scrap timber to help me put the windows together. These windows are hung so that they are bifolding. Some pictures below.
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