its a very time consuming job taken them apart but i have been doing it for ages so you get used to it but have broken a few bits in the past and ruined some decent models thats why people appreciate them so much as they know how tricky and time consuming they are to get right and make them look like they were done like it already and with all mine all my wheels turn and steer and are removable where as most others are just glued on and you cant steer them