coincident constraints for bodies ?

[luiyingchun]

I have just successfully constructed my first parametric model which is a box composed of 4 vertical boards and 2 horizontal boards. I think all necessary constraints have been specified so that no matter how the dimensions of the box and the thickness of the boards are modified, all the boards will touch each other nicely at the edges.  To constraint the distance between the top and bottom board, I have specified the z distance as a formula "innerheight+thickness" ( user parameters ) when copying the board at the bottom to the top.  This works but I wonder if there are ways to avoid using formulas but use coincident constraints or other simpler means to make sure that the top board will always be touching the top edge of the vertical boards.  The .f3d file is attached.  Thanks in advance.

[davebYYPCU]

That formula does the job. 
There are many ways to skin a cat, but from a single sketch, and bodies, job is done.

Progressing to Components, you would need a grounding and a rigid group.

Might help….