to be honest fitting a 19in rack mount 24 port patch panel in there will be a mish/impossible along with an ont and a router switch, and possibly a UPS of some description.
unless you plan on running a network rack where you can mount all the equipment like a 19in patch panel and switch etc i would go for a smaller mini 12 port one like this: https://cdlnz.com/PP-MINI12-C5E and a small 8 port switch to go with the 3 spare network ports on your router giving you a total of 10 network ports available to equipment from your cabinet.
then there is power for the equipment, at least 3 power points