I've never heard of a "Fues". 
UUhhhhhhhh...Is that what you light to set off a stick of dynamite...Boom!!! Guess I'm sorry I got involved in this mess. I just hate to hear someone skimming rules and sound like they are just making things easier!
Frankly I don't care what they do, but why do they always have to sound like they think they have done something GREAT by skirting the rules.
I admit I use sheeted foam wings from Mr. Hunt sometimes because they are much better than what I could cut. I simply do not have the building space or equipment anymore to accomplish it! However they are just two wing halves and take a lot of work to align, assemble, reinforce, install controls and finish. In fact it probably takes more work than to build a wing on my Adjusto Jig from a kit. Most of the ARC wings I've seen are not built up to my standards and I would not consider using them in a competition airplane! A few do fly fairly well!
I know a lot of Top Competitors and they do NOT use the methods suggested by Mr. Moritz. Nor do I believe they would.
Given that I do not care if others choose to do so. I would however be a bit wrankled if they told me how clever they were by doing it!
I fly in the upper middle area of expert scores or Bottom of the top if you wish and am no threat to win unless all the guys in the top area stayed home, and I do not believe that ARCs or ARF's are any threat there even if they get appearance scores. Unless of course Paul or David flew them...

(Fat Chance).
Randy Cuberly