Druid, care to explain how the saturn does 3d so that it's hard to rander to higher resolution? Is it like doing 3D via 2D tricks?
I believe the Saturn doesn't actually have any hardware capability for 3d - it's all done in software. Also, quadrilaterals were used as the geometry primitive (instead of triangles). Didn't Model 1 hardware also use quads? Perhaps they wanted to mimic it?
As far as I know the only real quirks with the Saturn hardware is the use of quads instead of triangles and it has a mad number of processors. Neither is really an issue for rendering at a higher resolution in a software emulator, but the complexity of the system as a whole is definitely one of the biggest reasons that Saturn emulation isn't more mature.