There are several reasons for my and others' interest in this simple gadget after reading an article about it. First of all - its simple and safe design, for the second part - its steadiness in the curves without any additional preparations required. Outdoor entertainment for kids and adults alike is hard to imagine without it. And for the third part - I just wanted to make it.
Sadly, there was no scheme available for it, so I had to improvise by building and drawing it at the same time.
The first thing I did - went to the shop to buy three bottles of local mineral water in PET bottles. While slurping the aqua vitae I was thinking about the future gadgets' dimensions.
And here is what actually came out.
Frame made of 10*8mm fir rails, clamps made of 5mm fir plywood. Birch plywood is naturally better, but that's all I had at my disposal.

Glued it together with "Titebond" - a good glue from the US. Similar to local "PVA", but it sticks faster.

Future part's blank.

One fourth of the material is removed with a table saw by moving the part back and forth transverse to the saw blade.

Can either be done like this.

Or like that.

This is, however, the result in both cases.

Rail dimensions are 8*25*145mm, where 145mm is inner size to the selected spot. Removed one fourth with a safety margin.

Rear frame. 700mm span.

And this is what happens when you can't wait to see the final result, but actually estimate and determine the dimensions.

I made this motor mounts' part of 1.5mm birch plywood... a bit thin I guess.

Rear supports.

Supports are installed at the most possible distance allowed by the bottle.

Motor mount and all other parts of this unit are made of 3mm plywood. It's actually 1.5mm plywood glued together resulting in 6 plies.

Front bottle support.

Flight deck with battery mount openings.

The idea was to make the unit demountable for easier transportation.

This is how the hooks look like.

Something like that.

Glued in some diagonal supports to make it less thin.

The idea was to tie the unit together with rubber band. The band has to be hooked up to something. So I came up with he decision to rework the front mountings.

This way.

Cockpit and hood at the same time.
Base made of 1.5mm plywood, remaining parts made of foam for accumulator's well-being.

Covered it all up with a ceiling tile. No picture, my bad.

Glued the flight deck with a ceiling plate from the bottom.

These parts here are now for the safety arcs.
165mm long (145mm by the openings) and 20mm bright.

The steering.
The bar is made of a fishing rod (the length is determined locally). Wooden parts of 110*18*1.5mm plywood, with double lower part for better screw hold.

I used empty 1.5l beer bottles as steering surface, making it 6l total. I have managed to empty just one bottle and had to look for the remaining ones.

Mounted the PET parts as follows. Connected upper and lower parts pair-wise, screwed them to plywood and mounted everything together. Connected the PET parts together with a construction stapler.

Lower and upper steering mounting openings.

The upper one has already suffered.

To prevent the steering from moving up and down alongside the axis, made a thickening of a heat shrink tube.

Back to the cockpit.
Mounting by the hooks. The cockpit is lowered, shifted to the back and secured by the magnet rotator.

As few instruments as possible! The steering is most important. Steering is life and breaks are for cowards!

Here comes the pilot!

He gets a windshield to freeze less.

The very first ride has shown some faults. Fir plywood broke up on icy borders.

Changed it for 6mm birch. Plastic or aluminum would've been perfect however.

Have additionally secured the arcs with a screw.
The arcs are of 4mm wire covered by heat shrink tube.

Weight without battery 1215gr
Accumulator: Li-Po 3S
Layout (WinRARarchive.rar)

Something like this.
Questions, if any, are highly appreciated.

This is the translated version. You can read the original Russian article here.