Planed fir beams.

Multilayer oak panels (multilayer planed panels with two oak top faces).

A little bit of sandpaper to smooth lightly the edges only of the panels finished in oak.

Mastic to glue lightly not definitely in 4 - 6 points the oak panels. In this way, the oak panels will in future disconnect using a palette or knife for a possible maintenance.

As an alternative compared to mastic, the big oak panel can be fixed with 4 small brackets and 8 screws on two longitudinal beams, along the inner side.

Metal brackets. Angle brackets and flat brackets to link the wood beams. In iron, or satin aluminium, painteds, or made of brass, etc.

Long iron wood screws ...

... or long bronze wood screws.

We also need some short screws when the wood is hard in a particular area (hidden nodes).

An electric screwdriver.

To facilitate the entry of the screws you can use an awl before screwing (useless for the experts).

Water-based color paint.

For a two-color, it is useless to buy two different colors. It uses a single basic light color. To get the second similar darker color, it uses a part coloring it with a concentrate color of the same shade. An exemple: basic color pink, reinforcing color using the additional liquid magenta concentrate.

Obviously as an alternative to water-based colors, you can use the oil paint and mineral spirit, or finishing the top table with the semi-transparent oil based-wood, etc.

A paintbrush.

If you use natural colors or otherwise breathable paint, then you can "feed" and protect the wood with a final beeswax polishing. The semisolid white beeswax emphasize the color. The semisolid natural yellow beeswax makes the color more oldest.