Hi Dolando, I built a fretless from walnut, it's a *****ray style but with the construction in the style of a Wal....... a one piece black Walnut core, Cherry veneers then Claro Walnut facings front and rear. I read somewhere on the Wal site that walnut is their preferred wood for a fretless (they ought to know!) and my favourite alltime sound was the fretless custom I had in the 80's so I went for it. Walnut looks lush, it's not too heavy and accepts finish very well, especially gunstock oil ( I think most are made from walnut) which I see you have opted for on your other build, it's also nice to work...........although the dust tastes interesting! I used Maccassar Ebony (the stripey brown variety) for the fingerboard, and some have commented that there's not much contrast in colours, now this doesn't bother me but if you are using Wenge for a neck it could all get a bit too brown! If you take a look at some of the gorgeous basses on the ACG site he quite often uses Ash with Wenge which looks awesome and I should think that as far as the influence of tonewood is concerned will be as good as anything for getting your desired sound. Are you going to be using Warmoth parts or making it all yourself? Either way it sounds a great build, I'm part way through a build with a Wenge neck and top, it's a bugger to work on but very pretty and apparently very effective! Good luck and keep us all posted