I am planing out a build, and was wondering if this was a stable neck plan for a bass with 6 or more strings. The neck blank will have quarter-sawn quilted cherry sides, a 3/4" or more purpleheart center, and 1/16" walnut accents between the cherry and purpleheart. The neck blank thickness will be 3/4" with a scarfed headstock, and i plan to go with 1 LMII truss rod, so i will only have to route a 3/8" channel. the fingerboard will be 34" scale quarter-sawn bloodwood, 10" radius. will this be acceptable for a 6 or 7 string, or should i add carbon fiber rods or 2 truss rods (i don't like the idea of 2 truss rods at all)? do you have any suggestions? also what are some common nut widths and string spacings, and some common bridge spacings and string spans for a 6-7 string bass?