If you prefer obj format, you can export your model from SH3D to get additional control. That way you can edit the text in the obj/mtl file to change the reference to materials on the different surfaces etc. But watch out for the texture when you export. SH3D will convert your the .jpg to a much larger .png file (but you can still use your original .jpg instead of the .png if you change the name in the .mtl file). And, of course, you could manage your future models with the Furniture Library Editor. ok
I really don't have a preference myself and 3DS is fine with me since it works so good, but since I'm offering it to the masses, I guess their preference would be my objective.
I also forgot to include a readme in the zip (it's been added now), which would basically say:
When you get to the third import furniture screen, make sure Keep Proportions is checked and make the width 6 feet (1.5 meters, 45.72 centimeters, 457.2 millimeters)
The best place to submit files is to create a ticket in 3D Models Contributions Tracking System. This will also be helpful for everybody to know the license under which you want to distribute your models.
Edit 1: It says that obj files are preferred but the modeling program I use doesn't export obj files very well, so I'm guessing a 3DS file would be OK?