Building a Fretless

Allo friends, I'm currently eyeing up a body, and scanning for an appropriate neck, funny feeling I may need to build one however. Looking at building an offset 30" scale BassVI style instrument, 6 string, trem, fretless, potentially with markers/inlays. Any advice/suggestions around this? From what I have read denser fretboard wood like ebony is better, marks up less.