You have a lot of good and well-thought-out ideas here - for you, we would then have to invent a job title and a compensation model for it. The consulting benefit is easy to communicate and leads builders to better decisions. Side job done yourself.
Hehe... in real life, I probably wouldn't be keen on helping customers realize their wishes for a dream mainstream city villa. I'd rather just use this here as a pastime, as Katja did. If someone likes it, then it has served a purpose.