That happened to my brother and he said to keep talking to Ada and eventually you should be able to do it. It was also telling him to build it at the boathouse and but he built it in covenant.
The slow scripting issue even hurts their own content, hope they find ways to speed it up (reduce the script lag).
Thanks for the reply! I have tried building it at different settlements, same results sadly. After trying to upgrade her & only seeing the leg category i exit the workshop and try to talk to her again and she literally says nothing back to me. When exactly do you mean to keep talking to her?
He just said that he kept talking to her (with the talk button) and talking to with the other options and all of a sudden she said that she was ready.
Script lag.. I never knew what to call it. Now I know. So many bugs and glitches can be fixed by simply going slow. "Having problems? Just stand there for a bit.. quit fiddling about!" should be an instruction in a booklet on how to play Bethesda games.
Thanks, sileightydrift. Just sent you a PM to get some more info to investigate.