Hello there,
First things first. I'm far from a genious.
The part A1d is the railing, it's in the PE sheet with the helicopter pad railing (dense one), some more of that railing with small stanchions can be found in the PE sheet with the Kinzhal launchers (big roundels with eight small circles on it, don't know what you know about Russian weapon systems). However, if I were you, I'd wait with that part. (most of the PE is unlabelled and if you really can't find a marked part in the CNC part of the kit, often you can find it in the PE sheets or a it is a resin part)
I was also planning to make this forward deckhouse, yet haven't done that yet since I immediately noticed there are quite some errors in that particular part of superstructure. Funny thing is that the whole structure you want to build was provided to me in a resin molded version. So practically the base was already there. However the finish is somewhat disappointing, so I might end up scratch building it entirely after all, although I'm not sure, possibly I can fix it. One more advice, if you see pre-cut doors in sides etc. Don't cut them out, just leave the inside in place and glue the PE doors (with Cyanoacrylate) on top of them, they are just large enough to cover the pre-cut lines. Same counts for lifebuoy parts. Whatever is marked on the parts by pre-cut lines, don't cut them through.
As for this sheet, you're obviously a lucky one as the right part of the sheet, the unmarked part, are the parts which I'm missing, they are the sides and the top layer of the roof of the forward superstructure on top of which sits the aft AK-100 gun. (
http://i32.photobucket.com/albums/d19/s ... ion1_3.jpg)
The lower sheet contains the main deck, and the unmarked parts are again missing from my kit, are the helo aft stabilisers. The horizontal as well as the vertical planes of the helo tail.
Another question, have you decided already which unit you are going to build? As mentioned before, it is quite important if you want an accurate representation of a certain Udaloy to decide it quite early on.
A small idea, haven't tried it myself as I don't have it, for your decals. Although for the future, maybe you can spray or paint part of your helo deck white first. Afterwards you can put the PE decals on top, keep it firmly pushed down by hand or a small amount of CA glue, and paint (best spray in this case I guess) the remaining helo deck Red or Green as your unit had it. This way you use the PE part as a sort of masking piece. I don't have this nor any decals so I'm still looking for a way to get my helo pad markings painted. With spraying I've noticed on horizontal parts that paint doesn't really tend to "crawl" below the masking, so if you spray nicely 90° you'll still have pretty clean edges.
Another option is first paint the helo deck and afterwards take out the helo part from the PE fret and use the fret as a mask, with a spunge dipped in paint (slightly, so that the paint doesn't drip) and start pushing slightly. It's the way we put stencils (text and symbols) on real ships too, although the stencil is made of old navigational charts instead of PE frets
I intend to put my pennant number on the hull like that, and possibly I will use our good old technique for my helo deck too.