I see and get peripherally involved in "guttering" on commercial buildings. You need to be bloody careful that where you have hidden, male into female joints that they're watertight. I repeatedly see blockages further down the line, backing up, and there's no second line of defense. It overflows the joint and water enters the building! Regular rodding / maintenance is essential.
Excellent philosophy, Mark. If you want to reflect gradually then a set of topic based blogs would be really valuable for future visitors. Ask one of the admin team for a blog. Mine is about "Details". Then have an "update" thread which you update on the forum each time, so people notice.
Aim to learn and help others learn from you think were mistakes, and some might turn out to be decisions of genius. Was the extra expenditure:
Gold plating that you or the architect added?
Things that you underestimated?
Elephant traps that suddenly appeared (eg ground conditions requiring expensive foundations or flocks of bats)?
Planning type stuff or consultant costs?
You set me off to look at at "The Medic House" by AR Design and I admit as done there they seem to me (personal opinion) have missed some important details (eg seem to have created 2 brand new bedrooms in the flat roofed 'pod' that never get any sunlight - driven by a decision to use Permitted Development not Planning Permission?). May do a blog about it.
Well, one of my three 10mm samples did just fine. The only difference was that it was matte finish and the other two were glossy.
I'm going to order some more samples just to make sure, but as I prefer the look of the matte anyway I hopefully have a winner.