By Ffion Lewis An army veteran who built a castle by hand to help him cope with PTSD is now being made to tear it down. Mikey Allen has attracted people from as far as Canada and New Zealand to a hill high above Wattsville, in Caerphilly’s Sirhowy Valley. On top of it is an impressive stone fort that he built entirely from scratch. On a clear day, you can spot the stone structure through the clouds from the village’s main road and often see its creator busy at work. While it may not be the most famous or grandest fort in the country, its heart-warming origin story has captured the hearts of ma…