Hi Jim,
I got the ASP a while ago and thought this would be a good application for it. Jim Lee made the venturi, I haven't flow the plane yet. The weather has been nice while I am at work and the weekends have been raining or windy. As far as same as the Magnum? I have seen many people say it is made at the same factory and the specs should be the same. I think there is a post on these engines some place here so you could probably do a search. I'll post a performance follow up soon.
I would like to point out the tool used to slot the hinges. It's called Areobroach, I saw it at the Weak Signals Show in Toledo. You get the tips and I used an Exacto knife handle. I tried it at the show and it cuts real nice through the trailing edge. I still use an alignment tool to get the center, but I didn't like picking out the waste. It was not expensive and it's my go to tool for slotting.
I doubt I can say anything new about Walter's kits that hasn't been said. Top quality, makes building easy, I would never scratch build as long as Walter is putting kits out. You just can't duplicate the quality. This was a fun build my first kit was a Nobler and I still love them today.