This is a great idea to use old cardboard box !
First, the wood to make paper is planted for , nobody is destroying the forest to make paper.
When you use wood, a tree die. Many times, you have a wood piece that was knock down illegally...
Paper materials can be recycle!
My kids played in cardboards doll houses, I make a ballet scenery with cardboard (it is more light). It is easy to cut. I love cardboard material!
You can make this in others sizes, even a normal scale (use united cardboards with a thickness about 2 cm -1 inch)
Step 1: What You Need:
Old cardboard box
A hand saw
Hot glue or PVA glue (spend more time)
Clips that you use to dry clothes (sorry, I don't know the name in English)
Fabric enough to cover 3 pieces (a strip of 30 cm)
Plastic sponge or cotton wool
Step 2: Cut the Pieces
Open the box and cut 3 pieces
Cut 1 piece : 32 cm X 20 cm
Cut 2 pieces : 9,5 cm X 20 cm
(the bigger measures in the "vein" direction)
With a pen and the ruler:
Piece 1: Make lines with pen in the bigger side: 5 cm + 8 cm + 7 cm + 12 cm.
Piece 2: Make a line in the middle of the bigger side (10 cm + 10 cm)
Force the pen in the lines to easy to fold.
Step 3: Fold
Fold the piece 1 as following:
The line central in a opposite manner to parallels lines .
The central line form the back of seat. The part that measure 5 cm is a front base and, the 7 cm and the 12 cm together form the back part of the sofa.
Fold the piece 2 (2 pieces) in the middle
Step 4: Make Soft
Use the sponge or cotton wool in the central part of the little pieces (2 cm) . Fix with PVA glue or hot glue.
In the big piece, cover with sponge or cotton the seat and the back parts. Use a little more to cover part of the back support as show in photo.
Step 5: Cover
Cover the side with sponge with fabric using PVA glue or hot glue only in the fold lines (make finish looks better).
Step 6: Finish the Fabric Cover
Turn on and fix the borders inside.
Step 7: Assembly 1
Make a sandwich folding the 2 small pieces in the middle. Adjust and fix with glue. Clip until the glue dry.
Put glue in the 7cm part (back seat) and then, join with the 12 cm part as show the photo
Step 8: Assembly 2
Fix a small piece first in the back border of sofa (preferable with hot glue) If you use PVA glue, then, find a way to fix the piece in the right place and wait dry (spend a lot of time). Make the same thing in the other side.
Make the same thing with inferior front part in the central piece and the lateral and hold on. If you use the PVA glue, fix the parts in the right place with tape and wait dry.
Step 9: Assembly 3
OK! The sofa is formed. Now, lets reinforce it.
Turn on the sofa (down inside).
Fill the junctions with glue (this reinforce the structure of the sofa)
For make the structure more strong, put zigzag strips inside the empty space as show the photo.
Cover the base with paper.
Step 10: It Is Done!
You make a Barbie doll sofa!
Maybe, if you increase the thickness of cardboard put together many foil, you can this sofa in a non scale size. You can reinforce the inside like a show in the doll sofa or use some strips of wood.
There were many thickness of cardboards. Cardboards used to packing dippers or refrigerators are more resistant.
PS:- I don't know the right name of certain things. I live in Brazil and my native language is portuguese. Please, if I used any wrong name, help me.
Thanks and sorry about my English