The SLS I'd like to see redone as a Semroc Pro Series is the SLS Laser-X. The only balsa in the kit was the NC and transition, which both seem 3D printable. The transition was too weak anyhow, and subject to failure, so the 2nd build I drilled it out and glued in a hardwood dowel.

BTH-70 and BTH-50 would make it close enough for me. The interchangeable motor mounts are fantastic, I use the 4x18 and 1x29, though if I had to choose one, I'd probably go 29, since it looks better. I rarely used the 1x29 until the Estes E16/F15 came out, those are perfect motors. I built a 2nd 1x29 with a permanent 24mm adapter, to fly on 24/40 reloads.

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Paul
If we weren't all crazy, we would go insane - Jimmy Buffett
NAR #87246 www.wooshrocketry.org