Creating a simulation model from a 3D model object

Hello, i want to find a person that can take a finished 3D model in Blender add rigging and kinematics.

I want to create two models one for a 3D simulation software called MuJoCo and another one for ROS/Gazebo of the same model.
Atlas as a robot model already exist in a previous version for both MuJoCo and ROS, I want to update it to the latest version.

Both these seperated models should have one base model with the half ball hands and one with sandia hands (human like hands) attached to it.

I want the models to be created as real as possible compared to the real Atlas robot. With amount of movement, and adding sensors and cameras like the real robot have.
And as much as possible adding textures etc.

Atlas new model (i will provide this one):
https://www.cgtrader.com/3d-models/character/sci-fi/atlas-robot-boston-dynamics



I found a bunch of great resources to get started below:

Building a robot for MuJoCo

https://studywolf.wordpress.com/2020/03/22/building-models-in-mujoco/
Atlas robot: http://r.mujoco.org/forum/index.php?resources/atlas-v5.16/
and adding hands: http://r.mujoco.org/forum/index.php?resources/sandia-hands.18/

adding camera and sensors
http://r.mujoco.org/forum/index.php?threads/camera-sensor-in-mujoco-model.3709/
https://github.com/openai/mujoco-py/issues/249

Atlas ROS / Gazebo with sandia hands
https://github.com/team-vigir/vigir_atlas_common

Create robots with ROS
https://www.youtube.com/watch?v=laWn7_cj434

My total max budget is $500 for both of the robots. I'm looking for someone with previous experince of similar projects.