I'm always in the need for small plastic boxes to house electronics projects. With the departure of Radio Shack, these have to be ordered.

Instead, I've designed a box in SW where all the dimensions are keyed to a single set of height, width, and length dimensions. This lets me build custom boxes.
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Now: Doing the cover based on this is trivial....but what I'd like is a section attached to the lid that fits into the opening. This minimizes any leakage (although I know it's not going to be water or air-tight). Obviously, I need to design a thick lid and carve away a section that fits into the opening. It won't be very deep, just an eighth of an inch or so.

What would be a good way to use the existing opening to shape the lid? I could give up on the fillets on the lower bit and make it angular (which would make it simple to reference) but I'd like something a bit more elegant.

Ron Wanttaja