Reply by Moron

Maple (Hard Maple) is typically the wood of choice because it is tight grained and doesnt flavour food.

A miter joint is the best as both sections will expand and contract with each other.

Finishing both sides of the wood top is a must. I have done a few dozen BB tops and the two times I did not apply equall finish to both sides, the top culred up and literally tore the cabinets apart. Screwing the top down should allow for the screws to “float” to accomodate the shrinking and expansion of the top.

Good Luck

-- "Good artists borrow, great artists steal”…..Picasso