I did something similar in 2016 https://www.e-tinkers.com/2016/11/hosting-wordpress-on-raspb.... Instead of having Apache, I use Nginx. Instead of serving webpage from SD card, I setup a 512MB hard disk except booting still done via the SD card. The site is still running on a Raspberry Pi 3 till this day from my living room.
I checked out your tutorial, its very cool! Do you think the 512MB harddisk makes your site more robust for when there are many queries? My site was crashed last night because of the hackernews hug of death and I may have to upgrade.
As most of my website are static content (blog with html/css), plus the implementation of cache and having a nginx (instead of Apache) help to serves most of the content from cache instead of access to the hard disk. Use of hard disk is trying to avoid the wear-off of SD card, I did in such as way where the boot is still done by the SD card, only the storage are in hard disk.
