First import the base svg into scal at 5 or 51/2 inches high and cut. Now import the section at the same height, copy and paste a 2nd section or import again and cut. OR cut and fold the base by hand if you havent scal.
Fold to create a mountain in the middle and the gatefold score lines to create valleys.
If you are stamping as decoration now is the easiest time to do so unless you want to stamp over the sections together.
2 ways to insert the sections, neither are better than the other but sometimes it's easier to do it one way other times the other.
Now you need to slide the 2 sections into the loops created by the folds. This is where the accuracy is needed, too thin a section and you'll get gaps, too wide a section and you'll be gnashing your teeth trying to slot them in.
2) Lay the base flat and thread one section over & under and the next section under and over, as though you are weaving.