Had when i worked in a preschool and kids love them! I would use colored sand instead of white salt. DIY salt tray with alphabet cards. Easy to make and kids have fun smoothing out the salt after correctly making the letter
TEACH YOUR CHILD TO READ - .This Clever Cat assists children to write on the correct lines (Dotted Thirds here in VIC) Very cheap and easy to implement. Super Effective Program Teaches Children Of All Ages To Read.