For the back rest cut 2.5inch x 2.5 inch of cardboard and glue the fabric of your choice,after that glue the thread along the edges.Join the back rest from base by applying glue at the back of base.
Take 3 or 2 bottle caps.Apply glue at the edges of caps and join them together.Cover the caps with fabric and glue the thread at the joining line.Do the same to make the other arm rest and attach both of them at the base.glue 4 beads at the bottom of the base. Now! your miniature sofa is ready.Pop up the look of it by placing a small cushion at the back rest.
I've made the double seat sofa from the same process.I have cut 7 inch piece of cardboard for the base and made two base cushion with 3.5 inch cardboard piece glued the rest of it together and done!
As this is my very first tutorial, i will look forward for suggestions to improve myself! so please let me know if this tutorial needs more improvement.