:The big things are all those bumps
: sticking up and it's overall character which makes it hard to
: work with. It tends to split, doesn't take metal fasteners,
: doesn't yeald to edged tools too well and there are suspicion it
: rots and doesn't glue well.

Thank you all for the answers.
Actually this sounds very bad for me, Charlie.
I thought the bamboo was not so bad reading the Schultz' experience.
He likes the bamboo ribs... so i thought why not the gunwales as well.
Lukily you wrote me the reason just in time. ;)