Here is the link for chapters 6,7 and 8 of 'Bad Dad' by David Walliams- enjoy!
Below is a link to a lesson all about designing. Have a go at designing your own 3D shapes which could then be made into part of a model or maybe you could have a go at designing your own room using junk modelling just like they do in the video. For junk modelling you can use anything that needs to be recycled such as a cereal boxe or some old craft stuff as long as an adult says that it is safe for you to use.
Be creative and have some fun!