sorry I'd forgotten about this thread
and how'd we get onto the rear turrets? all that is to be said is that many different gunners "customized" their turrets with regards to their vision panels, some removed them completely, others cut them in half it was up to the gunner really, and which line do you mean? maybe you can circle it or something like that?
RE the production, me asking you to re-think was partly due to me being pedantic as the RAF used roman numerals up to and including Mk.XX, then reverted to Arabic numerals, so it should be the lancaster Mk.I, not Mk.1
next there are some mistakes with your list, this is the "Lancaster Consortium" or "Lancaster Group", either is acceptable, and they were responsible for the production of lancasters, lead, of course, by A.V.Roe Company Limited, the factories in the group that produced the Mk.I were as follows
Avro-
Chadderton (including the Woodford site)
Yeadon
Metropolitan-Vickers-
Trafford Park
Austin Aero Limited-
Longbridge
Vickers-Armstrong Limited-
Castle Bromwich
Chester
Armstrong Whitworth Aircraft Limited-
Coventry
the Woodford site was
not considered a manufacturing site by the group, it was first and formost an assembly plant for lancasters, so seven factories produced the Mk.I..........