We are about to tear down a hundred or so foot section of wood privacy fence in my backyard and I'm going to keep some of the wood to use for condos. The boards are about 7 feet long and 2 inches across so I may trim the length a little if needed. My I usually use 5 gallon buckets and cinder blocks for bamboo condos but there is virtually no risk of them dropping on their sides because the bamboo floats. I don't think cinder blocks are a viable option due to the lack of space to put the boards and concrete. I'm worried buckets will fall over if not on a perfectly flat surface when sinking. Any thoughts on good alternatives to buckets or have people had good luck with stakes and buckets?