Good luck with this, sounds great. It's a very ambitious project, especially with the timescales involved. How many have you got signed up?
The areas I know are
and there are some fantastic roads to be driven in these parts of the world. I will say this though, the daily itinery for day 5 especially is gruelling. I did Colwyn Bay to Swansea following the main/direct road from north to south last year and that in itself is a 4+ hour trek through Festiniog, Machynlleth, Aberystwyth, Llandysil, Swansea/Neath. That was a Saturday morning, leaving North Wales before 6. Remember that progress on rural roads is not always swift. Have you set any rules on how far from the coast you are allowed to be?
I hope this works out for you.
Will try and suggest some nice roads for the drive
