I went there today and... Problem solved !!!
The problem was the slot for the trigger on the receiver. It was like 2 times longer than the factory slot.
The top of the sear do not touch anything because it is the widened groove ( slot ) which is above.
I will take a photo tomorrow and post it here.
Solution : make an insert, weld it to the action and re-make the slot with good dimensions. That way I can use any swedish mauser triggers, factory and aftermarket.
After that, he will bed the rifle into the stock, cerakote the whole thing and....voilĂ !!!
The barrel is cut, recrowned, the headspace is perfect and the custom picatinny is installed.
I plan to *restore* the stock, steam the dings out and finish it with darker dye and many coats of tung oil.
This fall I also bought a scope for this rifle, a Vorter Viper PST 4-16X. The scope can't w8 to meet the rifle

I think the final result will be nice... I hope !!!