Shapeoko 2 upgrade

Id like to upgrade my X, Y Axis to make my machine larger. Stock size is 500 mm and id like to go to 1000 mm. Does anyone make a kit for this. Or just purchase the rails and associated hardware? Also when I’m designing a project the work space always defaults to 9.62 w X 9.62 L is that the limitation size for for the Shapeoko 2 ?