Hovers XL and XXL.

[dmitrynest]

Then players can build a real Helicarrier. These hovers require appropriate fuel tanks.

Or you can come up with a system of micro-modules (when smaller objects are inserted

into larger ones. In this case, there are special slots for insertion in the tanks or hovers.

What to insert? Nano-catalyst for fuel, reduces fuel consumption. Suitable only for certain fuels).