This picture was taken with 50mm lense, with f 1.4. One way to 'filter' out the background with the subject.
This is how it look with more depth-of-field, f11. Can clearly see the background with the texture, so to add up the 'artistic' fell, i lower down the depth-of-field, and make it look blur.
Here's the set-up, a paper bin. Alternative way for your Gundam photo booth. It suit the 1/200 scale gundam perfectly, but not sure about HG or MG kits. Think HG still can fit inside, MG might too big for it. Anyway, will do more experiment on this. Hehehe.
Not familiar with the word Bokeh?? Try refer here, http://en.wikipedia.org/wiki/Bokeh
How f relate to aperture, find out here, http://en.wikipedia.org/wiki/Aperture