This build is the best yet.

[Dark Knight]

Base is 3 block wide and 6 block long, top layer is 5 block wide and 6 block long. Three blocks in middle rear left out. It has a radar, shield ball, repair ball , small battery and a solar power supply. so I got a shield and repair bubble completely arround the tank. I took on an enemy 4 to 5 times larger - toe to toe and whipped him cold - no damage or lost parts. Try it you will like it.
Take note the battery must be charger - place the solar on ground and battery next to it takes maybe 30 secto charge battery.

[Jamie]

You can take a snapshot and post it in here - then anyone can load it into their game or buy it through the Payload Terminal :)

[Strilter]

Well now that i'm back from my 3 week ish hiatus... I'll have something special to share soon. (lets see how many geocorp blocks I can build my base out of without crashing my computer)
and at the OP would love to see a screenshot ^^ hit f-12 in game then go to your profile in steam and upload it then copy the link here. And also do what jamie said ^^.

[retrograde_orbit]

Hmmm... im gonna try it out.