Result is simple, sturdy and convenient. It does not take much skills or special tools to make it. Pros would probably point out some cosmetical errors or use different construction solutions. For me and my boys these tables work fine.
What you need to do this table.
Skillwise - you should be able to saw straight, drill straight, have enough patience to get your measurements right and that's pretty much it. I am not a cabinetmaker, not even a carpenter, but humble translator. That says all about required skills ;)
Toolwise - I used two different handsaws (big and small teeth), electric jigsaw, electric drill (6 & 10 mm bits) for dowel holes, dowel markers, electric sander (60&100 grit papers, alternatively you need LOTS of patience), electric screwdriver, hammer, square rule, rule, tape-measure, pencil, glue. That's it.
Materials - laminated timber: one pcs of 2500x600x28 (for the tabletop), 3 pcs of 2500x200x18 for racks and edges, some 50x50 for edge supports and legs, some fiberboard for rackbacks (plywood would be better, but I had the fiberboard handy).
All the measurements are in mm. That's a sweet revenge to all you inch-loving anglosaxons for those long hours spent converting your stuff.
Step 1: Design considerations
Tabletop main side is the same width as was original plate - 600. Length is 1500. Left side was simply cut from the end of the plate - so it is 600x450.
Leg- and rack height is 700, making total height of the table 728 (or a bit more if some felt gets glued underneath).
Kid and wife wanted wider racks, but I argued that it leaves too little legroom behind the table. Right-side rack is 550 wide.
Few words about the shape. I love this shape. I used to have it once and I find it most convenient, especially if you have a chair with missing or lousy hand support. Friends already asked if the radius of the circular cut is not too small. No, it is not for a kid.
In general you can determine the radius by assuming the best possible working position and putting your hands on a keyboard. Then it becomes immediatly visible, where the table should be to offer the best possible support for your hands. The radius will be surprisingly small if you do it for kids. I will not give specific measurements just because it will be best if you measure it yourself. And remember, if you pick too small a radius, you can always increase it later. The opposite would be difficult :)
Skirts and 50x50 under the tabletop are for structural rigidity. I left 20mm free edge, then comes 18mm skirt and finally 50mm support. With no drawings I messed up detail lengths number of times :) So think it through really well, before you start sawing. Most errors are fixable, fortunately :)