Hey Wess — this is in my range and I'd love to take it on. I work primarily in Godot 4, which covers the "equivalent 3D engine" option you mentioned — terrain with beach/cliffs/volcanic textures, a particle-based smoke/lava effect on the volcano, a simple ProBuilder-style structure, ocean around the island, and a third-person controller that can walk the whole thing. I looked at your references (Devil's Roar for the volcanic activity, Dragon Roost for how the terrain types blend) and that stylized-not-photoreal direction is exactly how I'd approach it.
I can deliver the full source project plus a walkthrough video within your 5-7 day window for $120. Happy to share my portfolio if that's helpful: https://sethbrowngaming-rgb.github.io/Websites/portfolio/

