Make your own CrossFit gym in your garage! Love Again Faster Equipment.
How to make your own fitness equipment! Much cheaper! (this guy makes some of the mistakes so we don't have to when we put it together lol)
Make your own gym from buying cheap equipment on craigslist
Here is a list of 21 Do It Yourself projects to create your own gym equipment at home. And they’re easy to make too.
solar pool heater
Solar Pool Heater ~ how-to
DIY Portable Solar Entire Pool Water Heater.
Solar Pool Heater - do some research on this. Some solar heaters aren't very reliable...
Absolutely the best DIY solar hot water collector instructions I have ever seen