A Dalek with this color scheme definitely wasn't seen on screen, at least to my knowledge... Just conjecture since I'm not as knowledgeable as others but they might mean genuine as in it was made by one of the groups who made the props for the BBC, like Specialist models or TPE, or like I believe you're trying to say, it's one of the background props repainted for this, which also might be possible.

I found this one in google images, but I haven't noticed it pop up here yet. I have the 12 inch figure of this, but I was surprised to see that they made a full scale version. Does anyone know if it was screen-used? If so, which prop/episodes?

Hello folks. Sorry to report there’s been zero progress. Got wrapped up in several other obligations but I finally have a source for materials again. My plan, Ekij, is the heavy one. I’m pretty good at fine detail welding so my first plan was to build the internal wrap and adding layers. Starting with a12ga wrap and stepping down as detail allowed to potentially 16ga. Nothing a steady hand and a pencil grinder won’t work out. Impossible Dream World, I’d have aTIG setup and less cleanup but I’m poor haha. A only minor problem when you’re an idiot with a dream. 

Excellent!