I have built a few townhouse-like board on board fences, but the new community I will be moving to requires a different type of fence. I don't remember the name of it, but it's sections are rounded concave down.

How do you build the template to cut these sections like that? Do you cut them before you install them? I can probably get my hands on a SAWZALL, is that the tool required for this job or is it just a jigsaw?