Question: How to mark where to cut a hole for a new window in your vanlife van.
Option 0: You can also just eye ball your cut and you will usually have no problems with the window fitting properly afterwards. If there are any gaps in the window they can be filled in with epoxy and silicone.
Option 1: Apply masking tape liberally on either side of where you will be making your cut. Then trace the windows shape using a sharpie; afterwards use a ruler to make this outline a few mm narrower and shorter to make sure the window is a snug fit.
Answer: 1