I'm trying to inset and extrude a peripheral slot as shown on this cube:
Except I'm trying to do it on a rectangular cuboid which has one side/face split into multiple non-planar sub-faces:
Method I used on the cube was to enter the edit mode, create two loop cuts for vertical slot in the middle, then select the outer edges of the front face and inset them. Finally, I selected the faces I wanted to be extruded and I extruded them in the direction I wanted (inwards).
Now, I have two issues when I try to do the same on the cuboid:
The inset of the outer edge is not uniform, i.e. side insets are bigger compared to the top and bottom one. I would like them all to be the same width. Is there is a setting to make this inset an exact value instead of being proportional?
I have no idea how to loop cut the vertical slot in the cuboid - loop cuts are aligning with the slanted edges. Any idea how to cut vertically across multiple sub-faces?
I'd appreciate any advice. Thanks.