Thanks people. I'm getting worried about the weight now - maybe i'll go for black/american walnut.
To be fair, i;m struggling to find a nice planed top and bottom blank in the right size anyway. The wenge was available from the seller, but not walnut, which is why i thought i'd go for the wenge.
I asked my local firendly luthier and he's worked with wenge , but now that weight that Mick and Manton has mentioned, i might give it a miss