The Island was done before Heart and Home, but around 80% of it was already a natural island which I just had to re-shape a bit.

https://steamcommunity.com/sharedfiles/filedetails/?id=2756335509
https://steamcommunity.com/sharedfiles/filedetails/?id=2756335354
https://steamcommunity.com/sharedfiles/filedetails/?id=2756335272
https://steamcommunity.com/sharedfiles/filedetails/?id=2756335203
https://steamcommunity.com/sharedfiles/filedetails/?id=2756335112

Did a small extension lately and considering how much stone it costs now to build up terrain I wouldn't recommend doing a big island base anymore, at least none where you have to do a lot of terraforming.