You have to design having some adjustability in mind. So as long as you can adjust out the "slop" you'll be okay. If you use center supported rails then you won't have to worry about drilling the end of the rails (rods). Since your rails are not drilled to support attachment to a center support, I would consider using some clamping mechanism that clamps the end of the rails to the center support. I would place the rails on a bed of epoxy. |