Real wenge is an option, but I wouldn't recommend it for a beginner
project as it's not easy to work with: hard, heavy, splintery, oily,
a respiratory irritant, etc. Not to mention expensive. Also, the
grain figure is radically different between the quartersawn and
flatsawn faces. If the refined quartersawn look is what you want, you
have to think about how you'll hide/mask the flatsawn face.
Another suggestion for a domestic wood is ash; it has an open pore
structure like wenge, and is frequently "ebonized" black
with dye & stain. Aniline dye followed by wiping stain followed
by top coat is one method I've seen.
I don't think that welded steel table structure will lend itself to
wood. The mitre joint at the top of the leg can be done, but you'll
need a spline or tenon of some kind, and the proportions will have to
be much beefier in wood than in metal. I also think you'll want some
continuous horizontal members (aprons, whatever) stretching between
the legs. Those joints in the middle aren't going to be strong enough
in wood. Maybe have aprons making an X, connecting opposite legs, with
a narrow rectangular frame around it to brace it. Gives you some of
the aesthetics of the metal table, anyway.
Also consider how well the table will resist twist; you don't want
something that gets all wobbly if everyone's cutting their food at
the same time.