So I am brand spanking new to 3D modeling, but my first crack at it is far from humble. I am using Wings3D to create this.

Attached is my general idea in MSPaint (nowhere CLOSE to accurate), the final product will maintain ALL Keplerian elements: Semimajor Axis, Perihelion/Aphelion, Eccentricity, Inclination, Argument of the Ascending Node, and Argument of Perihelion. I will be positioning each planet along their orbit at their position on 1/1/2000.

I decided to include all satellites that are considered to be of planetary mass, or close to it. The size of the planets, as well as their moons and respective orbits, will be on a different scale that I will determine once I have the framework complete.

First plate will be at a 1 AU:2 CM scale and will have Mercury, Venus, Earth (with the Moon), Mars, Vesta, Ceres, Pallas, and Hygiea. It will be at maximum 12.5cm x 12.5cm.

Second plate will be at a 1 AU:0.7 CM scale and will have Mars (with the inverse cone struts connecting to Mars above), Jupiter (with Io, Europa, Ganymede, and Callisto), Saturn (with Titan, Mimas, Enceladus, Tethys, Dione, Rhea, and Iapetus), and Uranus (with Miranda, Ariel, Umbriel, Titania, and Oberon). It will be at maximum 27cm x 27 cm.

Third plate will be at a 1 AU:0.2 CM scale and will have Uranus (connected above via the inverse cone), Neptune (with Triton and Proteus), Quaoar, Varuna, Salacia (with Actaea), Orcus (with Vanth), Ixion, Pluto (with Charon), Huya, Chaos, Haumea (with Hi'iaka), Makemake, Eris (with Dysnomia), and the unofficially named "Snow White". It will be at maximum 23 cm x 27 cm

And I've decided on a Fourth plate so that I can make Sedna fit reasonably. It will be at a 1 AU:0.5 MM scale and will have Eris (connected above via inverse cone) and Sedna. Sedna's orbit will be a disc, instead of a torus, and will serve as the base of the model. It will be at maximum 28 cm x 54 cm. there will also be a pole running through all the midpoints, for stabilization and generally to represent the Sun's position/influence.

I decided on using these particular planetoids based heavily on Mike Brown's studies as to which TNO's are most likely classifiable as dwarf planets, as well as which ones have been assigned names by the IAU.