(BTW if this is too weird for WWII - please move to weird war; I was a bit unsure where to post it!)
I started this conversion project months ago.
The E-Series is just crying to be used as backdrops for my Gear Krieg walkers.
The models were converted within 1 weekend, but after that priming and painting took ages. I always had some other more pressing models on the table.
Anyway - here they are: E-50 and E-75:

with two Gear Krieg walkers:

E-50

E-50 out in the woods

E-75 Tiger III

E-75 in natural habitat...

Full story, more pics, conversion guide, what models used; all here:
http://www.adpublishing.de/html/experimental_tanks.html