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 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 4000 to 8000 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.