Believe me, you dont want to build your own!!
When you at the top of that roof cleaning the the other side over the finials cos its a reverse pitch.....you want to know its safe.
I do mainly use the ladder as a stand off, but there are many times when u do need the roof attachment.
Another major part of the ladder is its adjustable feet, you deffo need these to be able to secure the ladder safley.
The money that can be earnt from this service is unbeleivable , the ladder will earn the its money back in no time. its a small amount to pay to be professional and be able to tackle any roof.
Up to now i havent come across any roof i cant clean. For safety sake....dont make your own!!!