I'm about to embark on a pelmet which has 2 internal & 2 external corners (it's for a bay window). I've searched all over & can only find instructions which cover external corners and that's all I've made before. How do I get a nice tight finish on the internal corners? Should I make one long pelmet and then stab stitch through on the bend to pull it tight and stop the fabric ruckling? Or should I make the pelmet in three sections (left, centre & right) and then sew them together up the back of the internal corner to form a hinge?

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