Hey what's up Frog,
I suppose you bought the Mirage 1/400 sub; if so, I would strongly recommend the Mirage PE set that goes with it, it dramatically improves the model. Toms Modelworks also manufacture such a PE kit, but their set is made for four different subs (http://www.steelnavy.com/TomsTypeVII400.htm). If you want to improve the AA guns, you can also buy WEM's Kriegsmarine Anti Aircraft Weapons (http://www.steelnavy.com/WEM400GermanAA.htm).
I bought most of the Mirage submarine fleet, and though it takes some time to finish building a kit, it is a great way to show the differences between the subs - types, colours, camo schemes, flak guns, snorchel, radar and radar detector, net cutter, etc... And it doesn't take a lot of space, unlike the 1/72 Revell subs... Fun builds, especially the larger type IX. I learned a lot on those subs while building them! I'm not finished yet, for I still have to build 6 of them - that's why I chose to take a break and go back to the larger, much more convenient, 1/72 and build a Schnellboot for this GB.
You can see a picture of your finished model here:
http://www.steelnavy.com/MirageU826Simard.htm
Cheers