Thank you Dad.

Dad,

Years ago you started me on the path that has led to my current career in construction. Thank you for teaching me what you know. Thank you for teaching me to appreciate hard work. Thank you for all YOUR hard work on the Death Star.

Love,
Your son

P.S. It is very good practice to put your name on your "plans". :)
P.P.S. For liability reasons it is even better practice to put your name on them using removable blue tape!