Mood lighting the games room, step by step

Inspiration:

@warzan this is all your fault as usual.  You did this and I couldn’t stop thinking about how cool it was:

So I started thinking. I could do that…
Research:
I don’t know much about this other than OTT used Phillips Hue programmable LED strips. It now seems there are plenty of knock-off systems that do basically the same for much less. The basic systems have:

• a strip of RGB colour changing LEDs that can do up to 16 million colours
• a remote for 16 basic colours including white, on/off, brightness etc.
• a power lead and voltage adapter which connects to…
• an in-line communication unit to interface with the remote or local WiFi signal and specialist end connectors to link the power to either one or multiple strips
• an app for phone/tablet that allows specific programming and 16 million colour selections

They are also apparently connectable to wifi-based, voice activated systems (Alexa etc.) but I don’t have one so I’m not bothered about this.

I asked about the OTT team VLOGing their experiences from when they set up the Hobby Hall lights, but I understand that they are very busy atm so it looks like it is just me and the Interwebs.
Firstly to measuring then. Here’s the games room:

I have an 8ft x 4ft table that I want lit. The LED strips come on a reel and are either 1, 5 or 10 meters long. I think it might be possible to cut them (will research this a bit) so wanting a light to extend the length of the table and be fixed to the ceiling roughly above the middle I need strips 2.5m long. I want to make sure that even when only lit be the mood light there is enough light to play by. Two strips are better than one. So that is one 5m reel with a kit to connect two separate strips to the controller.

The two glass display cabinets either side of the door are 1.1m wide by 1.2m tall.  So that is a distance around of 4.6m.  One 5m strip will do each cabinet.

Ordering:

I found these kits which had 5m reels in and when ordering 3 come with a 3 gang connector for the ceiling light:

https://www.amazon.co.uk/Strips-Lights-Google-Wireless-Control/dp/B07JHDJ1WT/ref=sr_1_2?s=kitchen&ie=UTF8&qid=1547585337&sr=1-2&keywords=wifi+wireless+led+5m+RGB+kit 

Not wanting bare led strips stuck to the ceiling I decided to put them into extruded aluminium strips which meant I could also use a diffuser and they would be easier to fit.  I went with these:

And to go with the ceiling light two 2.5m diffusers:

https://www.marcled.com/p2-led-profile/462-26234-p2-25m-2500mm-surface-extrusion-painted-aluminium-white-with-diffuser-2113456789004.html#/32-end_caps-yes_one_no_hole_one_with_hole/73-diffuser-opal_material_pmma

with four mounting clips (two each felt like enough, they have no real weight to bear):

https://www.marcled.com/raw-aluminium-/184-bracket-mounting-clip-for-led-aluminium-extrusions-profiles-2112349878900.html