@Belalucina - What I did was work on Henford-on-Bagley first, and used Snarkywitch's plan to change some of the lots. I only downloaded a few medieval builds, the ones where the brothers are living, changed the rental lot to Ye Olde Playground lot. Moved the McMillan household in with a fresh start, and just created an extra sleeping area for them & changed all the fixtures to off-the-grid. The old McMillan household, I downloaded a build from the library. For the Isle of Volpe, I downloaded the Knight's stronghold, which is where the King and Queen live, and some knights. I had to build a small horse shelter for their horses. For the Gnome's Arms Pub, I changed all the fixtures to off-the-grid and added a chess table, and a dart board. I had to make a small room in the basement to hold the small tv, one of the requirements for a bar .For the Scott house, I actually moved them to another lot and downloaded a medieval build for them to live in. For the Watson Farm, I left in-tact, except removing electronic devices, and changing all the lights to off-the-grid. Then I had to go in and change any women's clothing where they were wearing pants to dresses or skirts. This all took awhile, only because I was picky about what lots I wanted to use for the brothers. lol
There are two lots in Newcrest, my over-flow lots, which is The Stone Church and a lounge called The Wild Fox Tavern & Inn (both from the gallery). I think, because I am not using any cc, that it might have been easier for me. I felt that some of the builds in Henford-on-Bagley looked good as they were, and just needed to be off-the-grid.
I will be using Windenburg a bit later, because they have cousins there (I had mentioned that Ian's father had moved there to be near his brother), so, yes, they have relatives in Windenburg.) That will be a huge undertaking, as a lot of the lots will have to be changed, and then going into all the households to change their clothes. I had thought of putting the war camp that they have to go to on the Crumblin' Isle, but I haven't searched for that build on the gallery as yet.
I actually saw a save file that was a collaboration of a lot of simmers, and they re-did all the worlds to medieval worlds. I believe the save file was coordinated by divanthesimmer. There are mods and cc in the save file, so I didn't download it to look at it. Here is the link if you want to look at it. There are pics of the different builds in the different worlds. Looks very cool.
https://projectsims4filesave.tumblr.com/post/712040418107326464/the-sims-4-medieval-save-by-divan-the-simmer
