Hello Paul,
template making is pretty clear, now, thank you. Seems quite easy once you get the hang of it.

My doubt is really how to shape the hairline, since my old one is lost and I'm just left with a little fuzz which will probably disappear in the next few years (I suspect I inherited my granddad's pattern - the horseshoe - like my cousin, who basically went Mr.Clean-bald-when he was in his early 30s).

I'm afraid I'll botch the hairline contour since I don't really have any point of reference - believe me of not, I have no photos of myself from when I had a full mane of hair (16-22).

(Always been a tad camera shy).

Today I removed the concealer and that's my "real scalp". I apologize for posting so many pictures, maybe some are redundant but I wanted to give a clear idea. As you can see it's in a pretty bad shape (the concealer honestly did miracles).

As you can see I have:

1. Grey hair interspersed with black hair
2. An almost-bald patch going from the crown to the front
3. An almost non-existent hairline. Just a few hairs there and there.

As usual, thank you very much for your interest. Any advice is appreciated.