I am certainly no expert on timber or timber yachts.
Maybe you could use "Poor Man's Teak", ie meranti. I believe it is a rain forest timber and if you sort through the stock where you buy it and pick out the reddest or darkest pieces you will have a very attractive and easy to work material.
I used it for my skirting boards and architraves in my house and it looks fantastic with a couple of coats of varnish.
Economical to buy but not as cheap as pine.

Tassie oak is also good but I believe fairly expensive and hard to get.
Getting 10 m lengths of any timber is a challenge these days.