Thanks everyone for the kind words!
We do recommend always dry fitting parts before you make any modifications including drilling holes and painting.

Here are a few sets of instructions that may help you out:
http://www.mar-k.com/SPACING_BED_WOOD_BOARDS.pdf
http://www.mar-k.com/drilling_mounting_holes.html
http://www.mar-k.com/bedwooddimensions.pdf

Hope these help.