Wood is good, but metal is better :)
I am in the US, and just getting started in Blacksmithing. You have a spectacular anvil. I've got an old Peter Wright that weighs in at about 209 lb (95 Kg). I would love to have one like yours, also. But, if I got the funds to buy it, I would buy something else I need more than a second anvil. If it is cast steel, it is ideal.
Several people in my forge group have metal anvil stands, made with heavy, thick steel plate and tubing, 3 legs with braces near the bottom (about 2 to 4 inches {5 to 10 cm} above the ground) to brace the legs, with thick flat feet. Some people chain the anvil to a stump, or to such a stand to dampen ringing. If the anvil is tightly coupled to the base, the mass of the base will increase the effective mass of the anvil. When looking for my anvil, several people told me to get the heaviest one I could afford, and avoid cheap imitation anvil-shaped-objects that have no rebound (no cast iron).
One tip I plan to follow is to add a 1/8 to 1/4 inch (3 to 7 mm) thick lead sheet between the anvil and stand to dampen vibration while still binding it somewhat rigidly to the base. You can buy lead sheet, but it is expensive. I am collecting lead wheel weights, and will melt and pour the lead onto my base.
I will first weld a barrier onto the top of the base in the shape of the anvil at its bottom to keep the anvil from sliding sideways, about 3/4 inch (19mm) high. Then I will fill the cavity about 1/8 in. (3 mm) or so with lead. After it cools, I will place the anvil on the base inside this barrier and clamp it down with angle-iron pieces. I plan to fill the hollow legs with lead or steel fragments to make it more massive. I'm hoping for at least 100 to 150 lb. (45 to 70 Kg) in the base. You are way ahead with your much heavier anvil. I have welded 2 railroad plates together (side-by-side), making a platform about 12 in. (30 cm) square, and about 5/8 in. (16 mm) thick. I used 2 double-shoulder railroad tie plates, and will fill the square holes that were originally for rail spikes before pouring the lead. The shoulders are down, with the flat part of the plates up.
The feet will be out of 3 in. (7.6 cm) square steel tube, about 1/4 in. (6 mm) thick. The feet will be pieces cut from another tie plate. The double shoulder tie plate invites being cut into thirds, and with 3 feet, it should work without any wasted material.
Wood is also good, but most of the examples I can look at are metal, custom fabricated by the smith, and I plan to follow suit.
I have also seen nice stands made from square pressure treated timbers about 6 in. (15 cm) square in cross section, with the grain running up and down and 4 or 6 of them bolted together sideways. If you have a dirt floor, you can even make them long enough to protrude into the ground about 2 ft. (0.6 meter) with concrete anchor. If you do this, you can make clamps with angle iron and lag screws to clamp it down. The wood will dampen the ringing a little, and I know several people with loud-ringing anvils that wrap a heavy chain around the waist to dampen it.
Don't forget to provide tool hangers for tongs, hammers, chisels, etc. on your stand at the bottom of the anvil.
In bocca al lupo (Good luck).