Thanks to all of you folks for the positive and encouraging feedback, it is all very motivating

That game you're planning already sounds like a blast.
I hope so. I will be doing GM duties and recording as much of it as possible. A report will follow here at some stage.
I had dismissed all the new Age of of Sigmar scenery as useless (it's still badly designed as a gaming piece, though: all that base area and there's only room to fit two figures on it).
Its a fair point, and believe it of not, I cant get a second figure to sit level anywhere on the piece without overhanging the base edge. It looks nice though, and in the strangely analogue mix of right and left brain activities that constitute "tabletop wargaming" that is an end in itself too.
The other AoS terrain pieces released to date dont interest me. Ruins are practical gaming pieces, but I am tired of gaming in ruined environments.
In the game that I have planned the gates will be heavily abstracted: and figure with a "key" coming into contact with one of the Realmgates will be able to continue movement from base contact anywhere on any other Realmgate, so standing on it wont be necessary. I also want the gates to facilitate extra movement, rather than just end up as a bottleneck or result in a Black Knight type causing a "None shall pass!" sort of thing.
I like the Realmgates, but found the usual skulls amongst the flagstones and the archway friezes to be off-putting for other sci-fi and high fantasy gaming. I think your versions with their more subdued paintwork show me that they can probably be generalised without too much work though, so I may give them another look.
With the gates being of extra dimensional origin, the skulls dont put me up or down, they just "are". Gozer/Cthulhu/Judge Death have skull friendly decorators I suspect

There are some miniature human crania on the base of the piece and there are two single skulls toward the top of the gateway. The top two could easily be removed or covered if desired. There are skull motifs here and there on the model, but as you say, it’s relatively low compared to, for example the (also beautifully engineered) Garden of Morr graveyard kit.
I think your painting has come on by miles since you started the "get stuff painted at any cost!" project. 
Thanks Major. I talk a lot about cutting corners in order to get things done, but in practice it always creeps back into the process. In my defence, I would never have got the Construction Crew at the start of the project completed in those sorts of numbers if I had painted them like I painted the Harbingers or the Administratum. Its a horses for courses thing, I knew I had fewer Harbingers and the like to paint, so I ended up spending more time on them.

The orange dress in the movie is quite reflective and high contrast (I suspect due to the copper/gold lining undergarment showing through the translucent orange). Rather than try to replicate that, I just upped the contrast in the dress from light to dark. Its a fudge that doesnt exactly match the movie look, but its definitely close enough to be recognisable and I think that it looks good in its own right.
Genius combination of models. I would never have thought of that, but seeing your great stuff together, it looks like they belong! 
I dont tend to convert models often these days, but I have a strong urge to connect miniatures from different manufacturers together via paint scheme and theme. It helps to avoid some of that cookie cutter effect that makes it hard for me to ever generate any enthusiasm about looking at - for example - yet another yawn-inducing, identikit army from whatever gaming system.
The process of associating disparate models together to make little warbands or scenario groupings is something that I find satisfying in itself. Im glad that it appeals to some of you guys too

Again, thanks for the encouragement everyone.