There is a whole modding community around the iPod video/classic.

You can replace the hard drive with MicroSD/SD or compact flash cards.

https://www.iflash.xyz

You can buy different color faceplates/backplates, upgrade the batteries, etc.

https://www.idemigods.com/iPod_5th_5_5_Generation_Video_Part...

I have an iPod 5th gen sitting on a drawer, I definitely need to check this out, thanks for the resources

Yes that is possible, I got gifted one such iPod once.