I started my build today-
First I needed to make my wall studs. The prices for materials continues to climb and climb. When I started my shantyboat project 3 years ago I bought 1/4" BCX for about $14 sheet. It is now $24 at my local Lowes! I purchased two 10ft 2x6's and one 8ft 2x6 to rip into oversize strips. They are 1.125" x 1.5" in size- I used a piece of 1.5x6 decking board to set the cutting width of my saw. I can easily make more pieces and they will always be the same size.
As you can see, the oversize studs have a lot more beef than a standard 1x2 furring strip. I can now use 1" foam board wall insulation.
Using a decking board cutting width, I can do 4 passes through the saw (5 pieces) and the last piece needs to be run through again to bring it to size, as it is about 1/16" too wide. A 10ft 2x6" board (@ $7.89 ea) rips into ten 5ft long studs at a cost of 80cents each. A 2x2-8ft furring strip is over $2 and cuts down into only one 5ft stud= a lot of waste.