Summary

UPDATE 2020-08-15
Links updated for light bars and bottom filament system.
OmniaDrop mount added

UPDATE 02/25/2020:
Check out my Ender 5 Plus customization many of the mods for the Ender 5 have been updated or improved, almost all work for an Ender 5. https://www.thingiverse.com/thing:4162889

I have put all of the mods that I have made or used in one place. Many of these can be done independently, others work together. All of the original sources are listed, If I missed any please let me know and I'll correct.
Sources
https://www.thingiverse.com/thing:4027970 E3D Hemera - Nighthawk Parts Cooler - 4020 Radial - V6 or Volcano
https://www.thingiverse.com/thing:4570662 Light bar set
https://www.thingiverse.com/thing:4072188 Hemera mount for Ender 5 EZABL
https://www.thingiverse.com/thing:3908933 Ender 5 Control Box Remix
https://www.thingiverse.com/thing:3845704 Ender 5 linear Rail remix
https://www.thingiverse.com/thing:3876601 Ender 5 Crossbar Relocation Bracket
https://www.thingiverse.com/thing:4570721 New bottom Filament feeder
https://www.thingiverse.com/thing:3661405 Ender 5 bed supports - Super Struts Remix
https://www.thingiverse.com/thing:4542519 OmniaDrop Mount for linear rails

I have replaced all of my Hemera units with OmniaDrop direct drive extruders.
https://www.youtube.com/watch?v=J2XxOWs_wyk

I have attached a PDF file with links to purchased and printed parts. Many of the parts are for specific mods, and may not be needed by you. An example is the linear rail mod, included are two extra MGN12H blocks. These are extra, but may be needed if you get a bad block or have a problem and need a replacement.
On the second printer I used a different hot end heater and thermistor instead of the stock units from E3D. Heater is a 50 watt and the thremistor does not have a connection 3 inches from the hot end, it is wired directly to the mainboard.

https://www.youtube.com/watch?v=nuj9KdpZX0U
https://www.youtube.com/watch?v=-7k2CNiOrX0