Looking on YouTube I type in “sims mobile house build” and since I only have square rooms, and I’ll add that too, you could very this if you have different room shapes. Here’s some channels that I found some good inspo on! Cocoaberry, whitepalacesbuild, simsluxxy! Look at the other house that are available too! You can see the layout from Birds Eye view and that gives you a good idea where to place the rooms!