Thanks @Polanskiman - yes sorry I did mean that tutorial - thanks for creating that.
After reading about the requirement for a specific Intel NIC to run 6.2 I decided to play it safe and stay with 6.1.7.
Ive been using 5.2 for the past 3 years, but have only ever installed it the once, and it has been rock solid since.
The clean install of 6.1.7 (I did not want to keep any data or DSM settings from 5.2 - had to reconfigure my disks/RAID anyway) using Jun's 1.02b bootloader and following your tutorial went smoothly, as did the in DSM update to 6.1.7 Update 3.