Itīs in Danish, closely related to Swedish. Anyway the pics are what you need. The first part of the text are common advices and the text after the pics are the rules that are no longer needed as the class is dead.
So modify anything if needed to make the Flipper to suit your needs. Surely you can adopt some from your RC-boats. Same, same but bigger :-) .
If you intend to use the boat single handed skip the jib and put the mast foot in the most forward hole.
My advices are:
1 Remake main sheeting ala skiff with bridle.
2 Make sure vang is at least 6x but preferably 12x.
3 Make the main downhaul at least 4x. On some mains the bolt rope has shrunk, then replace with 8mm rubber cord.
4 Be sure to adjust the rig tight enough.
Note, the rig in the pic is not original but the trim is the same.