Rooms and objects you can put straight into a portfolio, shared by the people who made them. Open the builder, click Files, then Library to add any of these.
Object · Decor · 11 KB · 58 triangles · starter pack
Credit: Created by mnostva at CGTrader — https://www.cgtrader.com/designers/mnostva
Object · Decor · 12 KB · 88 triangles · starter pack
Credit: Created by mnostva at CGTrader — https://www.cgtrader.com/designers/mnostva
Object · Containers · 6 KB · 28 triangles · starter pack
Credit: CC BY 4.0 — https://sketchfab.com/Brynnnnn — https://sketchfab.com/3d-models/low-poly-isometric-rooms-d53af0ad289a403598ee2cb41d84608b
Object · Decor · 15 KB · 264 triangles · starter pack
Credit: Created by mnostva at CGTrader — https://www.cgtrader.com/designers/mnostva
Object · Tools & machinery · 11 KB · 23 triangles · starter pack
Credit: Created by mnostva at CGTrader — https://www.cgtrader.com/designers/mnostva
Object · Decor · 11 KB · 44 triangles · starter pack
Credit: Created by mnostva at CGTrader — https://www.cgtrader.com/designers/mnostva