I can't imagine anything worse than watching someone build me a van, or a house, or anything for that matter. I only want to see the finished product. I'd be too tempted to say "can you wack that a little softer please!", "watch your belt buckles against the bloody paintwork would ya" Or "sorry, can you please go back, that bricks a little out of line". Right anal git I am. Probably why I run my own business. Like many people on here I imagine.