John, thanks. I will ask some following questions to your answers but if someone else wants to chip in, by all means please do.

You can see pictures with no concealers in the first post. Should I get you some other picture of the back of my head? If so, can you specify what exactly should it show?
I got a decent size sample last weekend. I think it shows the colour nicely. However, please not the colour of my hair on pictures is NOT affected by the concealer. The concealer is used only in the centre of the crown and as you can see both sides and the centre is exactly the same colour(s).

Again, the question of density. I am still hesitant of going for 'only' 70%. My hair is really thick and apart from the obvious crown area, the concealer does not make it thicker at all. Actually, with loads of concealer my impenetrable crown matches sides/front. Also, my front has been thinning over the years and is probably only 50% as thick as sides. However, even 50% density is enough to make the scalp invisible (unless parted).

I am not hung up on excessive thickness but from what I saw on this forum I conclude in my case the threshold of 'too thick' is higher than average. My eyebrows are bush-like and I have to trim it so I don't look like Wolverine.
Please, take a look at the first picture here: http://forum.toplace.com/showthread.php?tid=4164
If I suddenly show up with such density, people would think my hair actually got noticeably worse. Hence, I am afraid than even 70% is not enough for me (hell, I am not even sure of 75%).

As for base, I though of going all SFS. Some people complained about visibility of French and since I'd also go for small flaps, the visible hairline would be quite long. Besides, in everyday life hairline gets exposed quite often, anyway.

You mentioned 4-6 hold with Got2BeGlued. Did you mean days? I was hoping for reattachment only once a week. I don't really have much time during weekdays.