This is what we achieved with a wooden frame building.
It is extremely difficult to assess the ground works cost. In our case, there was an old ruin which needed to be removed and 30 odd years worth of overgrown ronce to get anywhere near the land clearance required to begin the building process.
It depends on the choices you make about how much ground works will cost. We poured thousands of euros into the ground to create a level slab on a sloping site but with the benefit of hindsight we possibly could have saved a great deal of that by not constructing a single storey building (bungalows take up more land space) and by using ‘I’ beams in the floor construction rather than a concrete ‘raft’.
The costs will mount up but I think you will will get a much better result by building a maison neuve than by renovating a ‘money pit’.
We bought the frame from an company in the UK who are well versed in French regulations and can provide their details if you wish.