Servers: one. No need to make the log a distributed system, CT itself is a distributed system.

The uptime target is 99%3 over three months, which allows for nearly 22h of downtime. That’s more than three motherboard failures per month.

CPU and memory: whatever, as long as it’s ECC memory. Four cores and 2 GB will do.

Bandwidth: 2 – 3 Gbps outbound.
Storage:
3 – 5 TB of usable redundant filesystem space on SSD or.
3 – 5 TB of S3-compatible object storage, and 200 GB of cache on SSD.
People: at least two. The Google policy requires two contacts, and generally who wants to carry a pager alone.

Seems beyond you typical homelab self hoster, except for the countries that have 5gbps symmetric home broadband.
If anyone can sneak 2-3gbps outbound pass their employer, I imagine the rest is trivial.
Altho… “At least 2 [people]” isn’t the typical self hosting

Edit:
Tried to fix the copy/paste.

Also will add:

https://crt.sh/
Has a list of all certificates issued.
If you are using LE for every subdomain of your homelab (including internal), maybe think about a wildcard cert?
One of those “obscurity isn’t security”, but why advertise your endpoints? Also increases privacy (IE not advertising porn.example.com)