I had bad luck with iPod hard drives... I’m surprised you’re is still working, or was there an SSD video iPod that I’m forgetting?
I did this with an old 5G video iPod and it was a 15 minute job. Worked better than new because there wasn’t the lag in switching songs from waiting for the HDD to spin up.
I also replaced the battery with a 2000mAh and keep it all in the 30gb case. I also replaced the headphone jack and lock switch so they were black.
Modding iPods is a breeze, too. Just be gentle when you're disconnecting the battery.