Cliff,
I hope these may be of some use. The WB quoted is 12ft 7ins.
These did not scan too well, as they are slightly larger than A4,(originally foolscap size).
They are from a collection in the Bovington Tank Museum Library, I had a commision from them many years ago to do a series of WWI armoured cars etc.
I did the Peerless with the 3" AA gun. I no longer have my plans etc, or at least I cannot find them anywhere, but will keep looking.
I do not know where the models ended up, as I have not seen them on display at the museum.
As these scans are not too good, email me off line and I will rescan them in halves.
email me at george.dfs1(at)virginmedia.com
you might be interested in my website
www.mooresmilitarymodels.co.uk
Am interested in what drawings you have, though not really my era, there are somewhere, details of the gun.
Let me know
regards
George.