Pat,
I have only put out deep structure when I was part of a work crew with lots of manpower and lots of large boats. Therefore, I have zero expertise on setting structure in deep water with limited resources.
However, from other people on the forum, I believe it is easier to get everything ready to sink and then move it into position with "floats". You just cut free your buoyant objects once you reach the correct location. I think(?) a couple of bleach bottles with handles might be enough to float two cedars and a cinder block into position.
If you need more buoyancy, then those big blue barrels can usually be purchased very cheaply when they contained difficult to clean contents.
If you are seriously considering this project AND would be doing the work by yourself, then perhaps start a new thread. There are definitely some safety issues when moving heavy objects in proximity to water by yourself. If you get better advice than mine, you might get the easiest and safest procedure possible.
