Undercarriage is now attached. I mounted the axles on the undercarriage before I attached it to the plane. I also mounted the axles on the undercarriage while it was upside down and backwards which presented quite a challenge to my ability to visualize things 3D. I do not recommend this approach. Had some problems figuring out how to get the tubes correctly mounted luckily a great fellow build blogger stepped in to help me a Mr Aaron Stampa. The tubes have to go in the hole and then back through the middle. That will make sense when you see the wheels. Also I found it easier to install the gasket that goes in between the two wheel house after I had the tube inside the tires and the tires mounted on the wheels. I then compressed the tire and simply slid the gasket on.