Another book is Mechanical Aids to the Smallholder by Denys De Saulles, I got my copy via the internet from Australia. One small error I found was the photo of the Monro Tiller is printed with the wrong way round ie miller drive appears on left rather than right.
Look forward to seeing photos, sounds an interesting project.
Easy solution to uploading photos is to download shrinkpic, it resizes photos automatically.
I was very lucky to get a copy in 1999 from New Zealand via bookfinder.com for a lot less than the one on that auction sent went for recently. As you rightly say a very useful book, giving prices of machines and attachments along with spec for machine often including weight.