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Don't think you can limit components to certain hull sizes; I think the limits are hard-coded to troops/sats/fighters/ships/bases.
It should be possible to create a separate component for each hull size, and restrict all other sizes from using the ones not meant for them. Unfortunately the restrictions don't work yet

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Again, I think the requirement for asteroids in a sector for building a planet is hard-coded. It may be possible as an extension of the Ringworld/Sphereworld components, but it may be fairly complex to mod.
I'm pretty sure its impossible for planet creation, but it is brain-dead easy to do for ring/sphereworlds. Those have a line indicating the mass (kt) of support components required to be in the same sector, just set it to zero.