Hello
A nice engine. I don’t think there is much around that would take this engine.
The plans that are linked are actually just construction guides for a glass and foam Magic kit that used to be made in Germany.
You could try and find some MK plans around on the net for a 45 size Aurora, or even a 40 sized Wolfgang Matt Arrow.
kit wise, I think there is nothing that you could just use, but would look at the Dalhotel 1500 ARF from Pichler. I think you could mod it to work.
You could find a set of 60 size Terry Westrop Loaded Dice plans and scale them down a bit.
Perhaps they did a Loaded Dice 40, but I’m not aware of that.
As an outside option, there is the old Clive Weller Murcura, Sarik plan number RM255.
I made one of the these using a clapped out side exhaust 60 ( as I was skint and had no money for a rear ex motor)
and it flew well. It was a pretty hard build, but came out light.
Personally I’d look for a Loaded Dice 40 plan, if none are around I would just scale the 60 down to say 52-55” span.
Rod