Cheers gents, and of course you are right, by the time it's filtered and weathered it should tie together.
Got a little done this weekend. First job was the areas of Zimmerit I'd (purposely) damaged.
First I infilled the holes with the undercoat colour, then went round the edges with deck tan to give the impression of broken concrete edges. I doubt any of this will be noticeable after weathering, but I'll know it's there.
The other thing I got done was hand painting all the little odds and sods. That's everything in paint now so I can gloss, decal and get on with the best bit (weathering).