OK, well this has taken ages... GIMP is a marvellous program that can do just about anything... once you work out the convoluted nonsense you have to go through sometimes to perform even very simple tasks.
Of course, lots of other things got in the way too.
SO I also downloaded paint.net, which is capable of far far less, but is easy, almost intuitive, to use. I did complicated stuff on GIMP, manipulated it on paint.net, and added some clever stuff from cooltext, free and incredibly flexible lettering.
Then there was a long process of trying to get things to all use the same scale at the same point (pixels? Inches? etc?), and oops the resolution has fallen too low sometime in that process, and finally damn will this now scale it properly to the createspace cover page thingy... finally we are there, as you can see.
Symm very astutely said that the spine is important too - here's the spine
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So now you can once again buy the darn thing. Best option: order it from your local bookshop. The ISBN is 978-1533007261
OR from Amazon or Barnes and Noble (where you can also get an e-book version)
http://www.barnesandnoble.com/w/the-dragons-run-gareth-john-jones/1124066873?ean=9781533007261http://www.amazon.com/Dragons-Run-Gareth-John-Jones/dp/1533007268/ref=sr_1_8?s=books&ie=UTF8&qid=1517526619&sr=1-8&keywords=gareth+john+jonesand in the UK
http://www.amazon.co.uk/Dragons-Run-Gareth-John-Jones/dp/1533007268/ref=sr_1_4?s=books&ie=UTF8&qid=1517532457&sr=1-4&keywords=gareth+john+jones