@sacboi , as always mate, thanks for the kind words and encouragement.
Just woke up this morning to a Zbrushcentral top row, which is a real honour. I can’t believe it. Plus I was contacted by Allegorithmic(developers of Substance Painter) who invited me to do an artist interview to discuss my use of SP on this project. Almost makes all the hard work worth it! 
@Joo52 , thanks a lot mate. You can’s ‘dragrect’ your alphas in SP, but you can use the any brush to just stamp down detail with whatever alpha you have assigned to the brush, rather than having to use projection painting via stenciling.
Also, in SP2, they’ve added a Normal channel so you can now stamp Normal map ‘alphas’, which is a really great feature.