I just bought a bunch of stuff from another modeler and one of the things I got was a plane holder made of PVC pipe..... He made a stake for it by taking a wooden block and drilling a hole through it.....put a long nail through the hole and epoxied it in place..... He could have made the U where the tail fits a bit wider....but the idea is sound..... I don't think I would trust it for anything above a .60 powered plane however....

You could make one out of iron pipe that would hold even a giant scale plane....

Just my $.02375 worth......