The easiest way that I found to make exactly 600 square feet, was to make a rectangle that was 20 by 30 feet. Thus, I had a rectangle. Then, I did a bit of thinking, and decided to put the bedroom in a corner, the bathroom in a corner, the entrance in a corner, and the living room in a corner. It resulted as follows:
For the design, I wanted a bright white background, combined with varying monochromatic shades as a background to a bright red, which would stand out quite dramatically. It was also a must that the floor be wood, because any floor that isn't absolute tripe is made of anything but carpet, so I picked a slightly dark, slightly red wood, which goes quite well, I think, with the style of the room.
When you enter the apartment, immediately what catches your eye is the bright red doors, starkly contrasting with the bright white walls. The doors on the right are rice paper sliding doors with a cherry tint, designed after the doors and walls from traditional Japanese style homes. Opening these doors leads to the bedroom, which is ten feet square, with a small closet. That object on the left there is simply a book shelf. Considering that at first only the doors were red, and the walls were entirely white, I decided, in order to make the apartment less plain, I would add a red stripe that cuts the walls in half, and have the bottom half be grey, with the top white. I think this worked wonderfully to cut up the empty walls.
Moving further into the apartment, the living room comes into view. On the left there is a standard washer/dryer combo utility, painted over in the same bright red as the doors. On the right, is a basic kitchen, including a stove, an oven, a fridge, and optionally, one could include a sink, if they find the room. From here you can also see the flat-panel wall-mounted television. The coffee table doubles as a dining table, for which those dining sit on the floor, also, according to Japanese tradition. Chairs are not provided. You can also see the balcony doors, which are full-window sliding doors.
From here, you can get a better view of the kitchen, the cabinets, and the sofa. Also, the rest of that bookshelf comes into view.
Inside the bathroom, there is a black and white tiled floor, to match the decor of the apartment. The sink is there on the right, underneath the giant mirror. On the other side of the counter, there is a shower, and past that is the small sliding door, behind which is the toilet.
Here is a view from the balcony, which is accessible from the large sliding glass doors in the living room. I had a difficult time deciding on the balcony floor, but in the end, I chose a gravel-esque thing, that's relatively coarse, like asphalt on streets. The railing is also painted in the same bright red as the doors.
And finally, from this view, you can more easily see the glass doors, and there's a bit of a glimpse of the inside of the apartment.
After a couple of weeks of work, I have managed to make this entire apartment completely from scratch, Importing absolutely nothing. In the end, I feel it turned out rather well. Sketchup is a terrible program, but it works!