I still fail to understand why radar works better on the moon then on a space based system.
Also, the weight of the computing resources is tiny compared to the scope optics and structure. Computer processing arrays, even complex ones are quite light and that includes state of the art mass storage. So the pointing issue is specious.

At L2 or such you do not have 2 weeks of darkness like on the moon. That necessetates big nuclear reactors vs solar arrays in free space at L2 or such.

Me, I'd build the radars on the Earth's surface. Very little if any atmospheric effects and you can build big mothas cheap.

I'd love to see NEO defense reasons for a moon base but I have yet to see any.

-philw