Your off to a good start with the already in place layout. I like the yard hydrant , that with an old weatherd short chunk of hose and a radiator watering can and your water theme is done. I like to see old tire stands with a gangster white wall in it,If you cant afford an oil rack at least a few qt. oil bottles here and there. The lite pole would be affordable if done in (EMT) pipe. You can weld it, and if you dont have a bender you can buy the pipe and all the different off-sets to get your long sweep type bends to get that 90 or 45 degree look you might want. Check out your home depot for all that. From what I could see from you photo ,you really cant come off the house for a island cover and keep the same pitch. Maybe something like a four corner support with some simple and cheap lumber and a corrugated tin roof. Dont forget motion lites to guard your goodies. Roger