Thing is, many people have completed really big projects, but ultimately there's a lot of help, guidance, parts, info, etc available, and you know you're not the first or only person to have problems or whatever.
Building just about all of it from scratch is a whole new ball-game when just about nothing is available. Some people are lucky enough to be skilled enough to recast (or machine from scratch) engine cases, hubs, etc, and others are skilled enough to build a frame or forks from pics and plans, but if you've done neither before and you have to plan, liase and pay for others to do the work then time and costs start mounting. Not trying to pour cold water on your plans but realism always wins through in the end.
Best of luck though, I feel you're really going to need it.