Toilet Paper Roll Skyscraper

I have a stockpile of tp tubes and I have a mini city. I thought for a few days and I came up with this design.
Supplies
Tp rolls
Cardboard sheets
Glue or tape
Scissors
Ruler
Pen or pencil
Cardboard sheets
Glue or tape
Scissors
Ruler
Pen or pencil
Cut

Cut the cardboard sheets into 2in x 2in pieces and 2in x 5in pieces. Then cut the tubes at 1in as shown in the pic above.
Design

Place the pieces where you plan for them to go. Do not glue them together yet.
Doors


Flatten the skyscraper into each floor. Then cut out the doors in each piece.
Glue / Tape


Clamp two pieces together and glue them. Glue the the parts to the floor and leave the roof open.
Assemble

Glue it to your city and then put the floors on top.