Looks like the same one we had at the park. Pretty good. VaFo had the simpler version.
In either case get the snap lines right before you start cutting.
get a rip blade.
And if it starts slow down, look for a loose bolt - dont ask me how I know...
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I think its fine for boards and slabs for your own use. That's a door jamb there.
If you're selling, find someone with a Woodmizer or similar, for a lot less waste.