Hi, First, thank you all for you answers. I did find a similar workaround yesterday evening. And this is exactly how i did it . Just for others, I edited all the "parts.cfg" included in the mod folder. Sometimes it's not called "parts.cfg" but it has the name of the part instead (ex: Nose.cfg). And I just added this two lines : TechRequired = start entryCost = 0 This make the parts available in career mod at the start of the game. Since I already have finished the tech tree, I made it available for nothing. But you can change those value to place the parts where you want in the tech tree. Hope this helps Hope this is clear enough as english is not my first language Cheers