Saw Angle Guide Parametric spreadsheet

Manual Saw jig for angle cutting.you can modify the parameter on the spreadsheet inside the freecad file.the stl file parameter:Inner gap (wood width) = 30 mmJig Length = 100 mmJig Height = 60 mmbase height = 3 mmwall width = 2 mmsaw gap = 2 mmI'm just learning parametric design, any suggestion are welcome