keithsCADservices

I personally don't think there should be Affinity Photo and Affinity Designer, I think the two apps can quite easily be merged, I find the fact they aren't to be an over complication for the sake of it. In Affinity Designer you have a cut down version of pixel editing and a slight confusion over what layer types there are.
You need to make sure the layer is a pixel layer and not an image layer, if you make your selection then press delete and the whole layer disappears you have an image layer and you need to right click and rasterise that layer, else make your selection and simply press delete and everything within your selection will be deleted.

If you draw that shape once, you could add it to the Assets panel so you could drag it out from there to add it to new projects. Not quite the same as a Rectangle Cloud Tool but close enough if the shape will always have the same number of humps.

Hi @keithsCADservices,
Welcome to the Affinity Forums
If you don't require the object to be rectangular, you can use the Cloud Quick Shape Tool, changing the settings on the context toolbar until you're happy with the shape -

If you require this to be rectangular, similar to the image you have provided then unfortunately there are no Quick Shapes in Affinity that can directly create this, so I would recommend drawing the shape manually, using the vector tools.
I hope this helps!

Should do a bit more to the flesh but it will do for now.

Did a bit more to it afterwards.

Hey again!
I do transit maps and diagrams for fun in my spare time. 
This time I'd like to show you my interpretation of a possible future commuter rail network in the Perth area, Western Australia.
Based it on the current project information and facts that I could find on the internet. So it is certainly not definite nor official.
I have done different versions which are attached.


Enjoy it! And as usual feedback is highly appreciated!
All the best,
Chris