The wrap can be done in 256 or 512, resizing the guide really isn't a problem at all. The lines keep detail pretty well, its just the texture you've gotta watch. Besides, I don't see 256 res being an issue for alpha-ing, if anything it is better to work at true res (except in very specific circumstances such as working with the Demon Hunter's face or Shandris/Sylvanas' face in which case you're better off using 1024 res). People get the wrong idea that 512 res equals better quality. Sure, it looks better in Magos, there's all that extra detail. You can texture on all those nifty little doodads that there isn't enough room for in 256. 512 is great if you're new to skinning or skinning for a game where you encounter large, high detail models. Ingame in WC3 is very different, the ingame camera blurs out the small details to make the texture visible at the standard camera distance. In addition, you can expect that if your texture is going to be used for b.net, it'll be shrunk and compressed to the stage where the detail is blurred to oblivion. The only way to catch all that detail you put hours of work into is to scroll in to maximum zoom, which no-one will do. On the occasion where you are skinning high res for accuracy or whatever, you need to be extra conscious of how the texture will transform when it is resized to 256. It's a tricky thing to get right. So I ask, which is the better quality in the long run?
Kickass model btw, I've already got ideas for what I'll do texturewise with it :3