/3/ - 3DCG

you can easily achieve this in blender

what you need to do is learn all the basic hardsurface techniques (extrude,move,merge,create edge,knife,cutloop,slide)
there are lots of tutorials online that let you create decent lowpoly from primitive shapes, just keep modeling and be patient.
you don't need any modeling plugins for blender, i do hardsurface in blender for years and i never had to download hardops or any kind of modeling addon

go through these things too

>shadeless materials OR custom toon shaders
>texturing
>UV unwrapping
>unity (the basics, importing and exporting, viewport)

good luck friend, ill put a few tutorials here just in case

https://www.youtube.com/watch?v=JjW6r10Mlqs
https://www.youtube.com/watch?v=rtO9maU709k
https://www.youtube.com/watch?v=wB0VgyN8tOw
https://www.youtube.com/watch?v=H-8w9nxfMGE