This book has the pieces cut out for you and is on stiff, almost cardboard, paper so that the models you create will be strong enough to stand up on their own.
Some of the models are pretty complicated and obviously intended for an older child.
Construction Books: Installment No.3
For the mechanically-minded child to construct actual models
"The Mammoth Book of Working Models" by C.K.Shaw
Interior page "The Mammoth Book of Working Models" by C.K.Shaw