Lovely bike with nice newly rebuilt wheels 
, well done for having the skill to lace up and true wheels, I need to give it a go myself as the guy who used to do mine has very sadly passed.
My first 400/4 was a red one👍. If you can try and run the throttle and choke cable between the inside of the tank and frame, there should be a chrome metal clip for them to run behind otherwise you may risk rubbing that lovely red paint off with the cable as you turn the handlebar.
Yep. The round clutch cable guide on the cam cover is on the wrong screw. It should be on the screw behind it, further back and further inwards. I'll post a pic if I can find one.
Correction: The guide should be on the outside breather cover screw. I found a pic where you can see it if you zoom in.
That's a really nice looking bike Gareth, just enough mods to make it look individual, bring it up to date but still keeping it as a 400/4. Honda should bring it back as a retro, that would scare Triumph with their 400! Maybe they could offer it in yellow as well as red (just saying
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