Thank you @SimplyJen, I'm very glad to hear that my builds inspire you! ☺️
I'm curious how long it takes on average to complete a build for you?..
It really depends on the size and style of the structure and how much of it is already finished like a blueprint in my head. For example, the designs of those spaceships are relatively "compact", and since they're not really based off of anything with almost 0% landscaping involved, they'd take me about a day or less to complete.
Medium builds such as farmhouses, cottages or shacks would take me up to 2 - 2.5 days in total.
Some of the larger builds e.g. Loftus Hall, are inspired by real life structures that I would go and visit and/or do extensive research on just to get the layout right. Even so, I'd still need to take a fair amount of artistic licence just to get it to work in game.
I'm not entirely sure how long anything that size - including larger castles- takes me to complete. I'm currently managing multiple build projects simultaneously (up to 20 ) so I'd tinker away at them whenever I'm in the mood and have a bit of time on my hands. I'd probably get a massive castle done within a week if I JUST focused on that build and did absolutely nothing else with my time, but I've never done that before so I couldn't tell... :D
Are you planning on rebuilding every lot in each world? Furnishing huge builds can be so daunting.
Rebuilding every lot in each world is not my goal at all, although sometimes it turns out that I NEED to replace all builds in a specific world, because a story requires it and the existing builds just won't (ever) do. A good example is Glimmerbrook, the world that came with Realm of Magic. I don't mean to be cruel or anything but my goody goodness, I find the builds in that world the least magical of all premade builds in The Sims 4. First thing I do when I start a new story save is demolish every single monstrosity in that town and replace it with something a lot easier on the eye.
As for furnishing (and landscaping) huge builds: I only ever build with a narrative in mind, which means that I have to consider the sims that are to move into a place as well as the household that lived there previously. Once that narrative is clear to me, furnishing and landscaping becomes incredibly enjoyable for me. I'd say in my case it's almost therapeutic, although I can certainly understand that decorating a grand mansion is not everyone's cuppa tea. ?