I have done the solar hot water but unless you use the hot water during the day, you still are bring cold water into your water heater and have to heat it. I prefer a tankless water heater.
I looked at these blocks and I don't see any thing to lock the blocks together. Without some sort of tongue and groove, it would be difficult to fill with concrete without having a blowout.
There is a nice sandy area just west of Pinto Point in Cholla. You can see it on google maps. I alway thought if I was a flounder that's where I would hangout.
I find that a lot of people get them selves in trouble because they don't want to drop a 50 dollar weight belt. I have dropped my weight belt a couple of times and it was always been a good decision. I have been diving sense the 70's.
Anyone know if it can be driven in two days. Also what city would I plan on spending the night at based on road speed conditions? I am planning on heading down next Wednesday with a group of guys to help out on Hurricane relief.