This is more a bug that ought to be solved, but perhaps you could include the icons in your template so you can view them in editor.
Which icons do you mean?
Baardvark is talking about this, already pointed by Sniper (with solution and everything) in the "EE Editor Problems/Bugs" thread:
1.This is an old problem but still present in the EE Editor. The icon previews do not load in the editor without extracting data from the icons.pak and placing them in the folder: Data\Public\Shared\Assets\Textures\Icons
The files are pretty darn small so perhaps you could just include pre-extracted versions in that location?
http://i.imgur.com/vFTIvfr.png?1Anything like that which makes the editor more usable out of the box is a good thing.
I also think is a good move to include that in your template.
BTW, great tutorials! I always planned to do something like this in classic editor but, well, didnt. Keep it coming!