One of the best places is the pages of MBM – before too long, there will be a construction article of something similar enough. For most of the other information, there is this forum and others like it which can be easily browsed through and/or questions asked.
Unless it is to be a feature riddled model, a diagram is rarely needed – many of the parts come with connections that prevent incorrect connection. They also come with instructions. While there might well be a book, it is likely to be well out of date – Action have a good selection of diagrams on their website.
Suppressors are only needed if you want the radio to work.