The pack is a part of Mech Constructor series, and can be expanded by

The Spiders and Tanks, The Humanoid Robots, The Turrets,

and the other Mech Constructor assets.

The textures match, and the parts are interchangeable.

The pack contains over 300 prefabs of different modules, that will allow you to create numerous combinations of flying, land vehicles and spaceships. Demo scene contains 40 assembled units.

The units are easy to assemble - most of the modules have snapping points for the other parts. Just drop the parts into the corresponding containers and they'll snap right onto place.

The poly count of units varies from 4k to 8k tris.

The textures work well with HDRP and URP (including Unlit) shaders.

Just convert the existing Built-in materials through the Edit menu,

and you're good to go. Tested in Unity 6.

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Animations:

Plane landing gear and small container legs: pack, unpack
Propellers: rotation animation - simple and with the blurred effect
Cannons: recoil animations
The "Claw" part: pinch, grab and convert to landing gear
Root Motion animations for buggies: go forward, turn
Root Motion container for flying units. Drop the assembled vehicle inside and control its motion with animations: moving forward, strafing, turning, takeoff, landing

Textures:

Hand-painted Albedo (7 color variations, works well with unlit shader)
Realistic Albedo (10 color variations)
Normal Map
Metallic/Smoothness
Emission
Mask Map for HDRP
Color ID along with grayscale Albedo

All the parts in the package share one tightly packed 4k texture altas.

There's a room for downsizing it - the Sketchfab previews

are with 2k textures.

Sci-Fi Vehicle Constructor