Try asking how much something should cost on the other forums and see how long people are nice to ya!
Except of course if you want to spend loadsamoney (unless it's with structural engineers and architects).
But most of them are very friendly and happy to share. Even joe-90 talks sense when it comes to building a house, it just all goes t!ts up when he posts on here.
If you can get oldun to answer your question then you are sorted.