That's the awening that I'd like to buy, reasonably priced and well, the ARB & TJM ones are pretty much the same quality, I've actually been told that they come out of the same factory, The only main difference is the price tag.
I have been thinking of doing a cheap mock up with just a simple silver tarp, poles and PVC pipe.
Cut a slit along the pipe, drill a hole in the end caps and have a rod going through the middle poking out each side, screw the tarp onto the middle rod and on one side you can make a handle to wind it in. A split pin would stop the rod from going right through.
A little bit like this....