Parametric Project Box

One of two fully parametric project boxes, one with 4 screws to attach the lid, and one with 6 screws, for larger boxes. Otherwise the designs are identical. The lid has a lip which fits inside the bottom walls. These designs are public on Onshape.com. The links are:
4-hole box: goo.gl/ZdkVYM
6-hole box: goo.gl/v9E0Rr
You can view the designs, and copy them into your own Onshape workspace to modify them.

The parameters are:

Width, Length, Height: overall outside dimensions
LidHeight: Height of the lid portion, not including the lip on the lid
WallThickness: thickness of all six walls (top, bottom, 4 sides)
CornerRadius: radius of the four corners
LidFaceRadius: Radius of fillet around the face of the lid
BottomRadius: Radius of fillet around the bottom face
Clearance: used between the lid screw bosses and the bottom screw bosses, and also between the lip and the bottom inside edge
LipHeight: amount the lip (and lid bosses) extend below the bottom edge of the lid
LipThi