raised bed building
has anyone built a raised bed before using green oak edging boards? i found this site that does them: http://www.uk-timber.co.uk/product_info.php/green-oak-board-p-78
thinking of building one 400m high (2x boards on top of each other). is this as simple as screwing these boards together into a box shape at each corner - or is there anything else i need to know/do ?