I have now removed the old hard tubing and replaced with the soft version, so much easier to work with and it has provided a lot more clearance for a bigger GFX card. The lighting is also much better due to less bends and a continous length of tubing. This took me around 4 hours to complete which included cleaning / dusting out the PC. In terms of the actual routing I have done so in order to facilitate a water cooled GFX card when the times comes.
The arctic cooling white fans have discoloured slightly, now with a yellow tint but everything else is exactly the same as it was almost 3 years ago. Still running the i7-6700K at 4.6GHz which unfortunately is not supported by Windows 11.