The sun rises due east and sets due west.
F (here's why) Bamboo isn't as thick as you think...
You would have to cut a bunch of them down just to have a 10 by 9 foot flooring. You CAN NOT curve wood what-so-ever. That's a big risk you're taking. It is likely to have one pound of changing balance and it will fall.
HOPE YOU UNDERSTAND BEFORE YOU END UP GETTING YOURSELF KILLED!!!!!!!!!!!!!!!!!
You would go upstream as in north if you would go down stream it would be south