General Aircraft Flying Wings

Hello,

I’m searching for references on the General Aircraft GAL56 and GAL61 flying wings because I want to scratchbuild models of them. I have found some photographs in old issues of Aeroplane Monthly (around 1993), but no general arrangement drawings.
I hoped there was at least a Putnam style book on General Aircraft since I’m interested also in other aircraft they did, however I couldn’t find none.
Anyone could be of help suggesting references on these subjects?

Thanks in advance
Fabio Beato