alright, i have been drawing out plans in school today been trying to figure out how to build a rainbow rail with 2x4's and a pvc pipe what would be a good reccommended length for a pvc and a good width? i will get my exact measurements of the pipe when i get home. in the building process i will take pictures and put together a site hopefully having many rail plans probably the site name will be terrain park at home well any advice is greatly appreciated