It looks like you have things rounded pretty well. Where do you want to add further rounding? Looks like you just need to soften the edges. You could set up Round Corner to do that for you but at this stage just select all of the geometry, right click on it, and choose Soften/Smooth.
Hi Dave. Thank you very much for your information and nice that you also finished the model. I wanted to be able to make the roundings first and only then the still missing detail
I’m going to install Eneroth Auto Weld and let you know if I can make the model the way you made it now.