I am going to have another go at it - however I still don't think it is going to come out like the pattern drawing.
I put some lines through the scaled drawing and they end up like I drafted it - diamond straight down one side and bottom line on an angle... This was without using my measurements but just straight lines on the drawing.
I then drew the 2 lines in question using the dots to go through and not the measurement lines
Seems that it doesn't line up - I would have assumed that the line for the dot in the right middle of the triangle should be an obtuse angle and on the right side of the paper and not an accute angle - so I will draft it once more and then cut and sew and see how it goes. I will trust the lines and not the picture.
Fingers crossed. I will update as I go.