The Goose Mk.11 is designed as a long range glider, so is not really suitable for anything else, other than carrying a small payload.
The current longest flight I have managed is 10M. It will go further, as it still has most of its height when it hist the wall.
Step 1: Materials
2 1/2 sheets of A4 paper. (you can get it out of 2, but the tail plane doesn't work very well)
8" of tape (again, less will work, but reinforcement helps the flight)
3 large paperclips (optional, for landing gear)
Something to cut a straight edge.
Step 2: Construction
2X8CM strips (cut lengthways) for wings.
2X6CM strips (cut lengthways) for tubes.
Fold the two wing sections in half, so that there is a 2-3mm overlap.
Tape the two edges together with three 1/4" strips of tape, 1/2" fron each end, then one in the middle.
The wings should now have a thin wing profile.
Just roll up the remains of the sheet the wings were cut from to make a tube, then squash it (but not completely flat)
Roll up the two 6cm strips into tight tubes. They will inevitably end up slightly conical.
Secure each end with a 1/4" strip of tape.
Cut a 6" by 8cm piece from the third sheet, and make a miniature of the main wings
Step 3: Assembly
Slide the two wings onto the wing tube, leaving a 1/4" gap in the middle.
Secure with a 3/4" piece or tape on the top and bottom.
Attaching the tubes:
Flatten both ends of each tube.
Secure the ends to the underside of the wing and tailplane with 1/2" of tape.
Turn over, and secure the top of the wing to the tube with 1/4" strips of tape.
Step 4: Flight/trimming.
To launch it, hold the tubes just behind the wings, and throw it smooth and level, at a reasonable speed.
Trimming is mainly done by bending the tailplane up and down, but major adjustments can be made by twisting and bending the wingtips.
When properly trimmed, it should fly level, but will usually tend to drift off to one side.