Is it possible to create a calculator like what we have for the drawers?  I am creating a product that consists of an inner wall skin with re-moveable panels.  Have quite a bit of it done as to where I can size the panels, change the top and bottom margins etc.  I thought it would be handy if I had a calculator as there are times when the panels are not the same size and while I do have entries for these I want to try something else.

Any ideas?