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Basswood is the premium wood of choice, but there is nothing wrong with clear white pine, or any pine with large knots - they have a tendency to "leak" their sap/resin. Yellow pine is notorious for this, plus the fact that it is very hard as mentioned. I have found birch and white cedar acceptable substitutes if basswood is not readily available.
Do you own, or have access to the tools to cut, plane and shape the boards?
If you buy stock lumber, no matter the species, be sure that it is kiln dried (or, at least fully air dried.) If you fashion stretcher boards from rough sawn stock straight from a saw mill, they will probably warp. Try to avoid that, unless you can get it at a good price. Take the lumber home, stick it and store it in your garage loft to "air' dry.
Jonathan
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