They arrived in Thailand early 2012 with savings earmarked for some months of fun and travel. 4 years later, in January 2016 they cashed in big by serving almost 13.000 customers in their 3 Sandwich-franchises around Phuket. Meet young Danish Sandwich-entrepreneurs Daniel Baven, 28, and Mark Perthu-Hansen, 25, the guys behind the popular Lucky 13 Sandwich in…