After reading the thread here regarding the radar arches it got me thinking about building one for my boat. I have an 1800 Lund Fisherman. Looking around on the net for fishing/radar arches and wakeboard arches for ideas plus the ones posted here have given me a general idea of what I want to do. Mostly, I want to mount a rocket launcher, lights and antennae on it. I also want to mount it with clevis type fittings so that it can be removed easily. I've found some prefabbed units , they run around $1200. What is the smallest diameter and wall thickness tubing that you would recommend? Also any suggestions on a supplier for the fittings? Bending and welding resources are readily available. The 2004 Lund catalog has a pic of of a 1850 Tyee with a wakeboard arch that shows the clevis mounts that I would like to use. Any ideas?