Bill Bramlage, did an article in OGR magazine about using replacement parts form a vacuum cleaner wand.
I found this at think vacuums web site - $7.95 1-1/4" in diameter and 19" tall. Could stack multiples. May also find them at a hardware store. Bill painted his , and added a plastruct ladder and some lights. Looks very good.
There are many sizes to choose from and you can get pretty imaginative of how you paint it.