Nipped down to the man-cave last night after everyone was away to bed and finished truing up my wheel - final stages felt a bit like ever decreasing circles, you true it up laterally, that knocks out the vertical deflection, so you fix that, but that knocks out the lateral, etc, repeat until crippled by sore back or blinded with permanent squint.
'Good enough' is the final verdict, although I'll know for sure when I use it in anger. Alex was spot on when he said use another wheel for reference... Even with referring to a built wheel, I didn't get my head around the spoke pattern until I had to partially de-lace it twice to correct mistakes, although now that I've done it, I think I could do another one without a reference point (although don't ask me to stake any money on it).
Kind of wish I'd splashed a bit more cash and went the whole hog with alloy nips and double-butted spokes... maybe the next wheel