SketchUp floor plan rendering [600sf]

We have an architects drawing with 2/3 of the walls layed out for a future space in a residential project. We would like the rest of the 2nd room drawn out and done along with the existing drawing in SketchUp. That's it! I will talk a little bit more about this project though: We are trying to add more square footage to bedrooms in this space, reserving the space drawn out for a game room. We hand drew some topo lines showing that the new space has mounded dirt that is higher than the 1st room floor level in some areas and lower in others. Considering organizing the space for a loft in the deepest area. This bid is NOT for further drawing than the simple floor plan walls. However, we may just continue on trying to get a good final drawing. I include a First Floor plan just to show the relationship. We will plan to use the same location for stairs going down as are going up to an upper floor. Pretty much just stacked. The white drawing shows some dimensions that fill in where the architects drawing left off ... but they are not critical! More-or-less.