I finished building my diff a few hours back, with the 'custom' pliers I posted. I also read through all the advice posted in the various topics (including that of Adam Skelding), and my diff feels both silky smooth and tight enough not to slip
I did have one small 'issue', which is that the nut is not very deep into the outdrive. I had a good look at it, and though I haven't made the upper links yet, it seems I can drive the car with a camber angle up to -5 degrees (or even slightly more) without having the driveshaft touch the retaining nut. So not really a problem actually, even though the retaining nut is further inside the outdrive on TD's release pictures.