Sr. Concept Artist at Coalition shared a nice video tutorial.
Min Guen, Sr. Concept Artist at Coalition (Microsoft), released a video guide explaining how you can create impressive mechas in VR with Gravity Sketch and then prepare materials and polish the model inside Blender. Please note this is not a step-by-step guide for beginners but rather an overview video that explains the whole workflow.
The tutorial was recorded promo material for a bundle that includes 200+ items: 2 fully rigged characters (25 preset poses and color variations), 8 highly detailed mechs, 32 highly detailed assembled kits, 170+ modular kit objects with UVs and textures, masks for kit objects and characters. You can learn more and get the pack for $250 here.