@Carbonazza, no, I did not ask for any particular tube thickness. I reckon that if the manufacturer don't go for butting (as per my research) they would be using a thick enough tubing. It is their name on the line. And so far, none of the guys whose commissions I've read didn't specify tube thickness and didn't report any problems, I just sort of trusted them. Btw, those reviews/project documentations I've read were about a few years old when I got around them with updates. So I feel safe to assume that the authors would have reported any problems if they encountered it.
If I recall correctly, one guy did cracked a tube (can't remember which though) but he did specifically say that it was his fault as he went with a smaller diameter tube, which a friend and the manufacturer did warn him of his choice.