parameter settings

This is where the parameter settings is. You will want to have it as an easily ascessible shortcut, so the 2nd image will show you how

where it is add it as shortcut

This is its interface. You can add custom words that will point to certain numbers, i.e. Wid=5mm, len=60mm etc.

interface

First, draw the bottom. Then extrude it.

step 1 step 2

now draw on any side, and extrude it too.

step 3

by using the offset plane, create the top part of the box

step 4

as seen in the 3rd image, the side has parts where it clashes with the top part. we can "combine" them to remove the extra conflicting parts.

step 5 - how step 5

repeat for the remaining sides, and you are done

final

Try it with the same file!

download here