Just for reference to any future reader:
Carsten Bookstore still have the plans for the electric version, Shrike 400: http://carstensbookstore.com/shrike400.html
They also carries an even smaller version, the Shrike 180: http://carstensbookstore.com/shrike180.html
I don't know how much it differs from the 1/2A-version, but if anyone's interested I can mail a scanned copy of the article (including a non-fullsize copy of the plan) for comparison. (I won't put it out in public because I want to respect their copyright (though I don't mind sharing copyrighted but unavailable plans (like those of RCM))).
/Stefan (who always fails miserably when trying to avoid using parentheses)