i am not very sure if my way works.
I used to use the Lego bricks to assemble the fixture for different kind of items (like cell phone cases)
as the lego bricks have it spacing already. I then use the set the spacing in Rasterlink 5 according to the position of the case itself. Somehow you may need to do a trial and error. But this is the cheapest and fastest way I have ever tried. Hope it helps.