Things you need to build it.
1. a plastic food storage
2. a piece of wood
3. Anything cute you want to attach to the castle
Step 1: Stone Age Method
A little while, you will see the knife turning into red.
Step 2: Divide Plastic
You may need to heat knife several times in order to cut all.
Step 3: Stick Them
Stick is just the same when we divide it. Use knife to heat those to be sticked surface, heat it into soft (tender), and put 2 soft edge together. once done, rince by water. Those soft places will stick firmly.
I found a plastic roof and stick it to others by the same method.
Step 4: Make Up
Use some sticker to beautify it.
Step 5: Raise the House Up
Attach the bottle to wood by screw. I rise the casstle to make it away from possible urine.