Theres not really much in it hardware wise, so you should be OK - however I would advise building this directly in the Unity iPhone engine, not the Unity engine, otherwise you will in for a serious shock. (lots of Unity functions are simply not available between the engines)
as has been mentioned in the other baking threads: What is your final output target? Is it max or a game engine? If its max, then bake in max. If its a game engine, then see how it looks in engine first, then see if you need to change things.
No! I spotted a flaw in the engine - the smoke from the explosion doesn't cast a shadow! (only the debris) hehehe Honestly though, I hear nothing but the highest of praises for Unreal Engine 3. I wouldn't doubt it in the least that the engine is capable of shadowing like that.
Kevin as always your work is amazing and such great inspiration. Those engines are pretty crazy looking. Were they based off real engines or did you just start making up things that seemed like a more sci fi version of an engine?
For free 3D engines, "the big 3" is your best bet. Project Anarchy is another but not the best looking engine out of the box. Marmoset is pretty amazing, and is probably what you're looking for. If you're just trying to show off models in a game engine.
While knowing the basics of engines helps quite a bit, I haven't worked with any big name engines yet and the problems we face are the same things that the engines dealt with years ago. So if you know an engine really well it can help but you probably won't encounter the problems that they've already tackled, problems that…