i have been experimenting with "ipe", (brazilian walnut) in gun building with excellent results. it is denser than teak, more resilient, and bonds well WITH teak! plus teak oil works great as a finish.the boards are almost always true. The problem is 2 things: it sinks by a little, and it is so hard that it is hard to tool,( CAN be done , just need SHARP router bits!) , Incidently, i get all of this wood free at my job,(trim carpenter) that is why i am experimenting,(also WHEN i am experimenting, if you know what i mean) but as i am sitting here with insomnia, i am looking at my night stands that i made last year from material off a job. They are made of "Kumaru,(spelling?)" the way the guy explained it at the lumber yard, is there are 3 grades of "IPE" Walnut, i forget the name of the lowest grade, but the medium grade is "kumaru" and the high grade is referred to as just "IPE" or true IPE, (i guess kumaru and the other one are not real? well whatever the case, i dont really care about wood that much but the reason i mention this is that kumaru DOES float! and has super resiliency with oil only,(we use it on oceanfront decks of multi million dollar houses on key west in place of teak , or true "ipe", which is more$$ anyone ever heard of this wood? what about other suitable hardwoods?