Sorry this is a late reply. I can see that mentioning molten salt was a bit left-field, However, it is one of the more realistic ways to store the huge amounts of power needed to fuel an economy for a couple of weeks (which you need in northern europe if you want to use solar/wind). Here’s a link about it:
https://onlinelibrary.wiley.com/doi/10.1002/cite.202000137
I am pro nuclear, but if we are going to descend into this renewable hell, then we need to actually think about how you store terawatt-hours of power. I really think that this kind of storage might be the nearest we have to a solution. we’ll only need it once we try to turn off the gas turbines, of course. It is fascinating that so many smart people don’t see that the whole jigsaw is missing vital pieces.
I have tried freecad a number of times to replace solidworks as a critical piece of closed source software in hardware development toolchains. I have always struggled. Yesterday someone spent an hour with me at a makespace saying… “FreeCAD has a different way of doing this/try realthunder branch/use symmetry condition/delete all conditions that coincide” … it has been worth years of trying alone. When I started solidworks the reseller gave me a week of training - this is often why complex FOSS software gets a reputation for being clunky, because alone you will spend ages hunting a GUI button in a complex interface.
TLDR: Go outside, go to makespace or a FREECAD conference - meet other people who use open source software - its much easier to use/learn from others than alone.