My new house has a number of oddly-sized windows (all rectangular, but
often of weird dimensions).

I'm trying to figure out if it's worth making my own storm windows.

Imagine the scene from a bad movie with the devil and an angel speaking
in a different ear. In one ear (not sure if it's the devil or the angel
saying this) I'm "how hard can it be? It's just getting glass cut to
size, building a frame, and attaching it."

In the other ear, I'm hearing "you've never done this before, you're
going to spend hours going back and forth to the store getting parts you
forgot, don't be a cheapskate, just suck up the cost for new multipane
windows."

Who should I listen to?

If I decide to make and install my own storms, can someone point to a
good book with plans? My basic all-purpose home repair guide has a
project for building storms out of acrylic and attaching them with
plastic tracks to the window frame, but that looks kind of tacky.

For reference, the frames are wood, the windows are a mix of casement
and hung.

The more I think about this, the more it seems like the idea of building
storms for the whole house is nuts, but it might be worth doing in a
couple of less-used rooms just for a rainy day project.