didn't we recently read here about its being certified or STD'd to a DHC Beaver?
I expect to be test flying the RED03 on the Beaver in the next month or two, but it'll be a year before it's approved, lots of testing in different environments required for Canadian certification.
What would peoples choice of powerplant/fuel be if building a new SEP right now in the 180HP area?
I think that for a new engine, your only choices will be a Lycoming 360/390, or the Austro E4 (if they're even available for such application). There is no turboprop that size, and if there were, the cost and fuel consumption would be high. Electric is the way of the future for some aviation applications, but flying will be different while we get used to not going very far with a heavy airplane.