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I have a client who wants a website in Spanish and one in English. Typically we would use a multi-language plugin for a single site (brandA.com/en or /es), but this client markets to their Spanish-speaking constituents under a different brand. So I am wondering if we have BrandA.com in English, and the exact same content in Spanish at BrandB.com if there will be negative SEO implications and/or if it will be recognized as duplicate content by search engines?

It might be a little too low IMO. We've heard there may be algorithmic impact by having the H1 too low, but I doubt that'd be much of a noticeable issue (never tested this ourselves though). I think more importantly you may run the risk of your users pogo-sticking from the search results, to the page, and back again because they don't see the words aligning with their search term fast enough. It looks like you could stand to reduce the size of the logo, the padding, and the main banner image without losing much visual appeal. That would help get the H1 text a little closer to the top.