Cheers, Colin. Due to my wanderlust and inability to stay in one place, it may be a few weeks, but I will do this and feature it here. Hopefully others might make some too.

The lighter heat will soften the copper, so do not do that, use a hot soldering iron and on the end at 90Deg heat and flow solder down, most insulation now day is self fluxing, so it should be OK
On my Weller Iron I use a number 9 wide tip.
See rough lines below.

Nicely done! That's a lot of work.

Thanks fellas.

I agree, full days labor making from scratch, especially the first time, might shave it down to 5-6h with practice.
Measured final diameter, 3mm per conductor

The sound most certainly is a step up in many areas.

First thing i noticed was the bass, big reduction in one-note-itis. The snaps, pops and thumps are very taut and you can hear more separation in that range.

Vocals, really nice, Ariana Grande- Dangerous woman, around 30sec in, she belts out a few lovely notes, really feel it, she rips into into it like never before, presence. 

Soundstage, larger and more accurate. Really ups the sensation of being surrounded by the sound, phase and time accuracy?
Music is more real, it all comes together, I dont even think of sounds being separated L/R. It was close before but this puts it over the last hump.

I did lose a little "sparkle" and "Air". Hoping some of that fairy dust will come back with a little burn in time, right now its a good trade off.

It is a clear upgrade from my bog standard 4mm OFC thats for sure, will be interesting to see what changes there might be after a few hundred hours.

I do hope others build similar cables, some more backing to my own impressions.

Edit: after 24h of pumping the sound of a babbling brook through it, can hear some of the wanted brightness/air coming back.
Blown away by detail in the vocals, in no way sharp just clear, can hear little vibratos, tinges of hoarseness, lovely.