Rack Cable management inspiration needed

Hey chaps needing some thoughts on this

I have the pleasure to re-arrange this naturally evolved networking rack (and some more) and want to properly re-do it, yet lack experience. I already cut down on anything unnecessary, but now lack inspiration on how to arrange it.

https://imgur.com/a/EmvDNXx

Telephone patch panel Analog? patch panel Fiber patch panel Telephone patch panel to different floor Telephone patch panel Telephone patch panel Patch panel 24P Switch - will be replaced w/ 24p/4sfp 16P+8 Fiber - will be replaced w/ 24p/4sfp ISP #1 Fiber modem Fiber patch panel ISP ISP #2 Fiber modem ISP #2 Fiber modem backup WAN 24P Switch 8P Switch -> distributes WAN ISP #2 to Watchguard (mounted in different rack, will be moved to this network rack) AND Sophos cluster a few devices of a client that has its own firewall 

my approach would probably be:

ISP stuff top, firewall next, patch panels, switches, client stuff

I'd love to get these but I dont think they will fit (8.4 depth, enclosure only has ~10cm to the door). Big side verticals obviously wont fit https://www.fs.com/products/64186.html

any other ideas?

P.S. any ideas how to route cables to the next server rack next to it? It used to be a massive tangled mess lying on the ground, which i cut down to a single cable by installing a switch in the rack itself - do I just add a conduit to protect it or are there some kind of top - cable trays that I simply havent seen yet?