Mikek,
I don't know if you're aware of a radial form of this kind of thing that's been around for a long time, used especially for coaxial terminations. It's just two concentric circles of Cu, with a bunch of paralleled SMD (or leaded) resistors arranged radially from the inner ring to the outer. It's assembled with conventional methods, with everything on-plane. The interconnects, feature sizes, ground planes etc depend on the purpose and environment.
Ed
