The author of this work describes chronologically, with the help of numerous photos and diagrams, all the procedure that he has conceived and developed technically, based on his own personal experience of making, quite easily and at little cost, an in-ground pool which is solid, and with limitless possibilities for size, shape and form. Different types of decking are suitable for this concept.
The author will not in any case be held responsible for the completion of your project. Your own ability and capacity to take the project right through to its final conclusion are left to your entire appreciation.

The PVC geomembrane used for the pool in question is a 200 m² rectangle, laid as it is and making folds which will need to be guided when water is added so that the effect is a symetric as possible.   The choice of asking the supplier of the geomembrane to welder or glue the membrane and get rid of the folds is up to you but will cost extra.

For the second part, as far as the decking is concerned, as you can see from the photos, the work is not finished, but what has been done on one side culd be done on the other side in the same way.  The same is true for the decorations. At the moment only the water pipe is showing and I can not describe what it will be like when it is finished.  

DIY enthusiasts who live abroad must respect the laws in force in their own country as far as the building is concerned, and they will probably need to look for suppliers of geomembrane and other materials if they are not ordering from France. They may also need a PVC welder.
As I speak English badly, if foreign DIY enthusiasts want to contact me, they will need to do so in French and I will reply in French.
    Your project must be done on stable ground (no landfill).
    The level of the ground water must be lower than the bottom of your future pool.  
    Fot the connection of the pump, the programming, and the transformer you must refer to the manufacturer's instructions, or use the services of   
    an electrician.