I wanted a stand that would hold my SP7 a little more straight up than the kickstand would allow without falling over.  I didn't know if it would be tippy so I planned to screw it down to a ¾" plywood base for a little more height and weight.  I printed with 40% infill, 4 perimeters and 4 top/bottom layers.  Rotated 45% on the build platform requires at least a 300mm ^2 bed.  The groove the SP7 fits in is 16mm which fits the keyboard folded back on itself.