Someone has to say it!
I wasn’t going to say anything as I don’t like knocking people’s dreams. But, lots of people are commenting (although mostly off topic) and I guess you must be expecting some brickbats!
It’s obviously a very personal decision to undertake this enormous restoration and I wonder what motivated you to do so. It was never a great car and it never can be. It will only ever be a quirky vehicle that someone many years ago with spare time and a welding torch once thought would be a good idea. I don’t think it ever was a good idea, but who knows the circumstances that gave rise to it.
The amount of time that will need to be spent on it is off the scale. I assume you must be a skilled welder or you wouldn’t have contemplated the project, but that’s only the start.
I’m sure all the parts (and you’ll need a heck of a lot of them) will be available from donor cars, eBay, Omicron, Tanc Barratt, Pieces Fulvia etc. but they won’t come cheap these days.
If you want a Fulvia (and why wouldn’t any classic car enthusiast, they are beautifully engineered) I think I would spend my time on one that will at least be worth something one day, thereby recouping a lot of what you are going to spend on time and components. It will also be guaranteed a great car to drive if done correctly. Some pretty rough ones are advertised from time to time, but they can make good long-term projects.
Sorry to be negative, but I’ve seen too many projects abandoned after spending an inordinate amount of time and money on them by the time the penny dropped.