A quick update. Got a bit further this morning – I added 6 wedges with sashing.
Not easy to do and keep the panel flat. The angle at the apex of each wedge causes a wobble in the developing edge – you can see it at the bottom of the image. I had to figure out a way to overlap each new wedge with the previous ones in order to keep the panel flat.
I think I’ve figured out I have to lay out the sashing strip, trim the panel so the sashing is applied straight, then trim any excess from the panel edge so I can sew a straight seam. When applying the next wedge, I can play with the width of the sashing so it narrows either at the point or at the outer side of the panel whichever seems right at that spot.
I’m about half done at this point. I have another 9 wedge pieces to add. I’ve squared the top and sides – the width is still around 52″ – I will trim it to 48 1/2″ (maybe 49″) when I’ve completed the whole panel.
I’m still not sure whether I want to use the piece with this horizontal layout, or whether I will rotate the panel 90° – that would necessitate adding something to either end because the panel at 52″ is not long enough – I’d need another 12″ or so.
I want to finish at close to 64″ in length whether the wedges are horizontal or vertical….