Summary

Bird-feeder with big volume. The feeder is designed to utilize a standard Ø110 sewer pipe which can be bought in most hardware stores up to 3 mtr long, cut to the size you can afford to fill up with bird seeds, and you won't have to worry about refilling anytime soon.
For my own use I decided to 800mm piece, just remember you need to cut of the female joint of the pipe.
You will need to drill a 57mm hole to accept the insert, which can be glued in place. The other pieces and supports can be screw in place with self-cutting screws.
After assembly the whole thing can be painted with a discreet colour which blends into your garden.