I do a lot of glue ups with pipe clamps..usually cutting boards that have lots of separate pieces, in a certain order. You know how it is..your fighting that open time limit on your glue…getting things flat and lined up…and the stupid clamps are turning over and moving around! Well I threw this little jig together in about a half hour. Pretty simple….just ripped some 1/2” baltic into strips, drilled some holes in one before ripping, then cut it straight down the center of the holes. Some quick eyeballed interlocking joints at the corners and it was done! I wanted to be able to break it down and store it flat..and then set it up quickly when I wanted to do glue ups..critical in a small limited space shop! I left the side joints a little shallow so there would be a gap to slide some masking paper underneath for easy squeeze out clean up. One mistake..I made the holes that the pipes fit in a little too big….I might use some weather stripping to shim the holes closed a little to hold the pipes a little tighter..but it works good..made gluing up this fairly large(15×23x1 5/8) side grain cutting board easy..and the board is nice and flat in the clamps!