Hello Bill,
They look like Type C for the upper wings and Type C1 for the fuselage, but then again, I'm no expert either!
The SAM book on the Lancaster, Manchester and Lincoln by Richard Frannks gives conflicting sizes for the upper wing roundal size as 8'5" diameter [101 inches] and 102 inches on the next page; I seem to recall that the 102 figure is correct. Your picture of DV170 looks to be the same size as the drawing in the book 101/102 inches - it's a smallish drawing!
There are many more wise old head with better references etc than I have, so I'd wait and see what else comes up.
It sounds like it will be an impressive beast. Any chance of you posting a piccy when you're done?
Regards,
Ant