I made my chairs from S4S red oak from the big box store because I wanted them to be durable enough to take camping. They come in standard widths and lengths, so you can nest/optimize your parts on the boards. Most parts are made in pairs, so it’s easy to flip one around so the tapers offset each other, etc. Once you know your work area (e.g. 3.5" x 24"), you can then drop the two nested parts that fit into an Easel file (back_1.svg), for example. Set your zero to the corner of the board and let it cut. Also, when talking about Adirondack chairs, most people don’t just make one, so there’s lots of opportunity to add some production-line streamlining. I would even go so far as to print the PDF plans and cut them out so I could manually lay them out on the boards I bought, then arrange them in Easel the same way.
Since Maslow has a fundamentally different approach than say an X-Carve, you could make a set of “shims” that are the same thickness as your workpiece (3/4"), then surround the solid wood board with these shims so the sled has something to ride against. It could even be as simple as other solid wood boards that will be cut out later, acting as each other’s shims. You could leave tabs so the pieces wouldn’t come loose, then just move your zero to the next board when the first cut is done and rerun the same file if you’re making multiple chairs or a different file that fits on the new board. You could even move the boards around if needed to keep the sled in the middle of the assembly. A few dabs of hot glue would probably be sufficient for “clamping”. A set of four sacrificial plywood shims that could surround the various solid wood parts might also be economical. I’m thinking they could be screwed in place into the waste board, capturing the work snugly.
I spent several hours cutting the pieces and sanding them just to make two chairs. While I was doing that, I kept thinking that this is definitely a job for a CNC. All the edges are straight, which are actually more difficult to do by hand. I used the “factory edge” whenever possible to help. Being able to setup a board, start the cut and go do something else in the shop (i.e. the next project, file, etc.) while it cuts a perfect set of parts that only need a little final sanding is an amazing way to make a set of chairs.
I’m looking at having to make a set of chairs for our new covered deck. PlansInWood.com has a set of folding Adirondacks that I may make next. That way they could live on the deck, but are easy to take camping or store in the garage for the winter. While I love my beach chairs, it would be very nice to have arm rests. BTW, whenever I go camping, lots of people stop by our campsite and ask where we got the chairs…