James,
I too am looking for U-boat plans. I hope to model in a larger scale but perhaps we can share some information. I know that most graphics shops will scale plans to what ever scale(s) we want. While I would love to support the folks that supply the plans I also know that plans are very expensive. What I am looking for specifically are deck gun/machine gun plans/schematics. I will keep you posted on anything I find out and perhaps you could do the same.

Thanks,
Pete Cruz