This tent has a hexagon shaped end. This is made up of various scalene triangle shapes.
Do you really mean a hexagon end? or is it a pentagon shape at the end; parallel to the ground at the bottom, two vertical 'walls' and two diagonals for the 'roof' ?
1. These shapes have a salvaged edge and a cut edge on the diagonal. How can I stop the diagonal edge stretching?
Overlocking will stop the diagonal cut edges from fraying but won't be very effective in stopping it from stretching. A line of straight stitching (inside the seam allowance) and/or stabilising tape is what you need to stop any stretching.
2. When cutting the shape, I cut the 1.51m edge on a curve so when pleated the two long sides stay the same length. Does this sound right?
I'm finding it hard to visualise what you mean, but usually when you have pleats that are not at exactly 90 degrees to the cut edge you have a series of zig-zags in the cut edge so that when the pleats are in place the edge will be straight.
3. When the various sized scalene triangles are put together I end up with a triangle 4.6m x 4.6m x 4.5m(pleated edge). Should my salvaged edge becoming down the vertex seem or the centre seem?
I would have the fabric 'on-grain' so that the selvedge edges are perpendicular in the centre of the triangle - if there is a centre seam. If not have the selvedges horizontal and thus parallel to the ground.
Also it is best not to include the selvedges in project like this. Selvedges are woven more firmly than than the rest of the fabric, and although polyester doesn't usually shrink/stretch much it is quite possible that when exposed to weather those selvedges will behave differently to the buk of the fabric and the seams will end up skewiff.
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