Looking great, CD. That is quite the variety pack. Surely you will get a winner out of all those.
>>>with seedling heating mat underneath(do not think necessary
You're right. A heating mat is not absolutely necessary but wow does it make a difference. Roots sprout much faster, seedling grows much quicker.
I like your seed method. My method is about the same but slightly different. I soak in paper towel until I get a root, then in cubes, inside a dome:
Fastest and most successful way to Germinate Seeds - Blogs - 420 Magazine ®