tom he is a stand up guy and simply a joy to work with. if it helps any i have worked with tom lots over the past few years. i've worked with him on 4 different builds and if times were not tough i would still have em all.
not to kick up a duststorm on tb but i agree with you on the wood. there are far too many variables to say that a wood that in theory should be darker will actually play out that way. weight, feel and aesthetics are the best way to go when it comes to wood imo. even then there are other considerations that will have an affect...
all together strings, fingers, pups, build quality, and build design will have a greater impact on sound imho.
again not to stir anything up i would also say that a good luthier once again in theory can build a great instrument for you but i would caution the part about it sounding the way you want it to. you are the only one that knows that and even then those variables mentioned above will have a huge impact.
i suggest striking up a conversation with tom and diving into his gallery to see what you like regarding options and style.
if it helps i would start by asking you these questions...
singlecut or double? (jazz is typically double)
# of strings?
1 pup, 2 pups, piezo or combo? (jazz-double single coil?)
fretted or fretless? (you said fretless)
passive or active?
then choose your wood and board!
also, perhaps the biggest advice i can give is to work with a someone that is patient to your newbie questions. once again i mean no disresepct as i was the ULTIMATE newbie with my first (second, third and fourth) build. i'm just saying you want to put your money, faith and future instument in the loving care of someone that treats you with respect. give tom a call