A prospective builder should know their limits and not assume they can replace a trained professional. But even among laypeople, the wheat is separated from the chaff: some have talent, can imagine 3D in their heads even without computer programs, and have acquired basic knowledge so that a fundamental design is created that the professional can then work with.
I am happy to assist in adapting a model house to personal conditions, to point out this and that even in architectural plans, or to check good self-designs for feasibility and, if necessary, to implement improvements to scale, which serve as a template for the professional. But I do not start from scratch if the future builder is either too stingy or too lazy and the project is anyway more like a temporary dream without foundation.
This Sweethome? It’s totally subpar anyway, doesn’t even show dimensions, and can only serve as a toy.
Better to pick up paper, pencil, set square, and eraser to give the draftsman _a feeling for dimensions_! I do not see that here in the slightest.
Regards