I think Wellcraft used plywood for the stringers. I would use. 3/4" Marine Tech PT but Kiln Dried After Treatment or even untreated. You can use 3/4" BC FIR as a cheaper alternative. I would stay away from the tropical hardwoods like ipe and mahogony unless you are building a very nice wood deck. They are strong but cost prohibitive and I believe a little too stiff for a backbone in a fiberglass boat. Besides if it has a center stringer, you will need a piece that is at least 12" wide. That may be a tall order ($$$) in the hardwoods. Then there are composites. More money. If you need longer than an 8' run you make a nice scarf joint in the plywood and reinforce with glass.
What glass did you buy? and what is your layup schedule?
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