I'd prefer to build it with bass wood. It's a bit harder and won't warp over the years. Everything I built with balsa back in the day has misformed as it aged.
I suggest sealing both sides of the wood . I am stuck on a Balsa Wood & Stick Stenson SR 7 (in 1/24 scale) due to warpage . The wings are immense . I cannot get them covered as they warp quickly . Time to seal the Stringers , edges . formers . Just Aircraft Speak for the wing framing less the skin . I would use basswood , I just cannot get enough here to do the wings . Thanx ..