looking for 1/350 Armada Scale (or anyone else's) HMS Vega

1. I suspect that the armada line was simply dropped.
2. Used kit dealers or Ebay (expect to pay serious coin for one).
3. Currently your only option is the Skytrex line of V&Ws in various configurations. These are 1/350 waterline kits in cast metal.
http://skytrex.com/ go to Navy world of models > HMS 1/350th scale metal ships
For a look at one of he kits check SMMLonline at http://smmlonline.com/reviews/models/v_w/vwskytrex350.html

Thanks for your help. The Skytrex kit looks like it might work. The challenge as I see it is that the superstructure is cast into the hull on the Skytrex. To modify the Vega into the Wren, I will need to scrounge or build 4.7" guns and shim/raise the upper decks/bridge accordingly. This seems easy enough on a resin kit, how difficult is it with a cast metal kit?

It is a soft white metal so most of the techniques you know about from resin translate to this medium also. Most of my kit bashing has been with 1/1200 scale metal ships.