Getting the turrets actually IN the body is a bit hard... You have to break the restraints (brackets) and lift the turret enough to get in. Then, rebuild the brackets and you're good to go. Works without restraints, although is wobblier and has a higher chance of falling out.
Nice! The plane can be a good scout vehicle since it has no guns and the Garlic Crusher is a good light tank. Just make sure to put cheaper blocks on since the 2 Helios AI Modules cost tens of thousands of BB.