The current rewards are pointless if you already have all 4 modules.

Something like
"Prototype Extraction Node"
Structure size 1 or 2
Limit 2/planet.
Randomly provides +2 mining/artifact/research
Randomly provides +600 attack/defence/cloak

These change each day/week RANDOMLY.

Or any re-usable structure would be good ^this^ is just an idea.

-1, but only because i'm out of their range now

I agree that it would be nice to have a second drop from Prototypes. I think just about everything else (elite/boss) has at least 2 drops so it would make sense. I don't, however, think it should be a planet structure. Thinking logically, the XRP Prototype is a testbed "fighter" type elite. It wouldn't have a planet structure in its cargo or integrated in its systems. A watered down Warp Fuel-type drop would be appropriate though. Defense +5% for 2 hours maybe?

I like Darth's suggestion +1.