We can make shelves bigger or smaller than our calculator can generate for you, perhaps look at our custom sized desk top calculator for large sizes, we can also make shelves in walnut, ash, elm, etc at depths thicker or thinner than 23mm to 30mm, contact us if you have specific shelving requirements or questions.
Oak or Pine?
This is a matter of preference, and also budget. Oak and pine have their own properties. Oak is a hard wood, whilst pine has hard and soft wood properties. Pine visually has a less tight grain, but still has lots of character. Pine is easier to mark and less glossy to touch and look at, and so you may wish to apply a polyurethane finish. Oak is less likely to mark when spilled on, and has a glossier finish.