Specifically, check deck books. While the steps is curved. And I think The first step is to make a jig by taking one sheet of 5/8" plywood and using a jig saw, cut two half moons 3/4" radius SMALLER than the largest step.
I think Power tools like a "power miter box" will make the cutting of the boards at the right angle quick and easy, this is a power tool that can usually be hired from a tool rental center or bought at a home improvement store.
I don't have had any photo of my deck now but I would like say that your deck photo is looking very beautiful. This deck furniture is looking awesome in a little outdoor space.
Deck cleaning is an annual task for many. Deck sanding and cleaning happens to those people who choose to use wood-damaging pressure washers. Cedar deck cleaning and sealing is now easy with oxygen bleach and a special epoxy sealer.
Ipe wood has the durability and strength of teak, for a lot less money. Ipe hardwood is also a tough wood to finish. Its extreme density prevents most finishes such as wood stain or top coat, from getting through the surface.