You can check my instagram: https://www.instagram.com/kabalarts_gamedev/
Also I have done Models for a game RoboRage here: https://itch.io/jam/brackeys-6/rate/1177874
I wanted to know how well you do Armored Core/ Gundam Models I would love to have you on my team if you could do that but they have to remain within the https://twitter.com/hashtag/256fes?src=hashtag_click parameters
Making an low poly robots (in the style you wish) is not hard for me. And I have some experience with low-poly sci-fi vehicles /buildings and robots already.
As requirement for you is 256 triangles or 256x256 texture?
Texturing such a small amount will be something new for me, but I think it will be very similar to pixel art , which I also do 😅