Very Cool @Tallbikeman Have you built an Octave Mandolin? I'd like to have one of those because I can only attempt to play a Mandolin my fingers are too big (or I'm just not nimble enough to really play a Mandolin) but I have noodled around with a Dean Mandocello (another very similar instrument) (I know folks use both terms interchangeably) I think either of those would be cool to own.
Guitar Carl I built the octave mandolin in 2008 It has a carved top and back. I build my mandolin and octave mandolin necks with very wide string spacing. I have meatball fingers and they will always touch the strings next to the one your picking on regular store bought guitars and mando's. This mando has a bend to the neck caused by string tension that I cannot get to straighten out with the tension rod. I'm getting ready to remove the fingerboard and put a small block of wood in the groove where the tension rod lies the wood will be between the neck and the fingerboard about halfway down the neck itself. That way the tension rod will be pushing the small block of wood up into the fingerboard and thus causing the neck to bend straight. The fingerboard wood is purple heart. Purple heart wood is tougher and stronger than maple. I love playing this instrument as you have noted above. Let me know if you want to check out one of my wide neck mandolin's.