Whoah! This GB is creeping up! Less than 2 weeks until 251 madness!
Couple of things I was looking at:
Lufty - there's a Verlinden resin set of German radios available...I don't have the set, but maybe it comes with some sort of photos/wiring instructions? Don't know how good Verlinden is with including instructions with their stuff, but figured I'd let you know. I can get you an item number if you can't find it.
Wingy - you should definitely check out WBill76's build log of the same 251/17 kit you're going to be working on. It's on his own personal website, lists a lot of tips to use with the kit, as well as what appears to be a complete list of errors in the instructions. If you need a url, let me know. I have it here somewhere.