This kit will allow you to make a working chair in Minecraft
Instructions:
Step 1: Dig down one in the spot you want your chair and replace it with the End Portal Frame
Step 2: Above your end portal frame place your stone and above place the rail and minecart (DONT MOVE THE MINECART)
Step 3: Break the stone
Step 5: Place stair down and put the piston behind your chair
Step 6: Use the redstone block to activate your piston which should place your stair in the minecart
Step 7: Enjoy