Step 1: What you will need
First off, you need a location to install the heater. Preferably, if you live in the northern hemisphere, a southern exposition. The location should have as much sunlight as possible all day.
That said in terms of supply and tools , you will need:
L shape metal rods (or wood it you prefer)
2 x 64 inch 1 1/4 inch diameter copper pipes
3-4 rolls of 1/4 inch copper pipes.
Welding torch (bernzomatic, plumbers stuff)
Acetone or other cleaner that can remove soldering paste