Attached are some construction pictures: Screwed solid wood planks (oak) with underfloor heating without screed

Hello everyone,
speak to my heart with the preference for a slightly springy step, the smell of wood, gladly also the acoustic feedback of walking on wood and above all no glue on the entire living area.
We are planning to install solid wood flooring on a large scale in a new single-family house, ideally combined with a surface heating system due to the combination with a photovoltaic system and an air heat pump – ideally underfloor heating or underfloor tempering.
In search of a dry floor structure, we came across various systems with lava split plates or wood fiber boards with aluminum conductors – as shown in the post by – and would consider these systems.
A few questions/experience reports would interest me very much:
1. Does the system require a significantly higher supply temperature than with a usual setup? Is the concept of underfloor tempering instead of heating feasible with this structure (regardless of the necessary heating load of the building)?
2. Are there noises when walking due to contact of the planks with the aluminum conductors?
3. Is the step as elastic as hoped?
4. Can you give a rough estimate of the price? About XX% more expensive than a normal floor structure?
Best regards and many thanks!