Attached a picture of my level 7 base for inspiration. I win 99% of heroic defenses and about 80-90% of defenses with this layout. I have a building in each corner of the base (which you cant see in the picture), then I have my traps dotted around the perimeter.
In my armory I have the following active for defense:
-Rocket Turret Heat Sink
-Rapid Fire Turret Heat Sink
-Sniper Guard Reserve
Then I often donate jump troops from my main level 9 account for defense, and activate a jump trooper equipment/skin.
Or, I donate speeder bikes for defense, then activate Dewback guard reserve instead.
For heroics I activate Mobile Heavy Cannon guard reserve as they seem to take vehicles quite easily.
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Main Account: Bacon (level 9). LINE ID: sgu97cab
Squad - NewSithEmpire
Second account: nEggs (level 8)
Squad - AUS-Darth_Gump