Hey All!
I must admit your project is very ambitious, and would love to see some pictures. My Grandpa was a Lanc Pilot with 9 sqn, and was awarded the DFM. I myself am a Cpl in the RCAC with Unionville's 351 Silverstar sqn and also run my squadron's Modelling club. Anyway, here's some info I gave give you.....
Toronto's Aviation World website offers Revell's 1/72 Lancaster Dambuster for 23.99 Canadian, a decent price for such a big kit. The fit is good, and detail is well done. I would definetely recommend this kit for such a project.
A few months ago, Britain's Aeroplane magazine published a photo rich article on the Dambuster raid, and is an excellent research resource.
By the way, here's an interesting story: There's a huge lawsuit going on in England right know over one of the Bombardier's (who was the only one who breached the dam) Log Book. Apparently a Con-Artist claiming that he needed artifacts for a local war museum was loaned the log book by the Bombardier's widow. Now she wants it back, but he wont give it back. Quite interesting really........
Give me a shout if you need any more help. After all, my name is the Lancaster_Lover!!!
Lancaster_lover
Bandit's!!! 12 O'Clock High!!!
P.S. The film "The Dambusters" is an excellent reference for your project.