To answer your original question, yes you can fairly easily install the 70-73 nose (I'd look for a 70-72 as they weigh less as an assembly) You can find most of the parts on ebay or craigslist. The lower front valance, marker lights, and brackets will be the harder ($$) parts to gather.
As far as whether you should buy it and store it, or how much work it will be, well, if it was easy, everyone would do it. If you want the car but don't enjoy the building part, then buy one already completed. I have built a few cars, it takes time, money, and you have to enjoy learning new things. My best advice is buy the most rust-free, complete car you can find, even if it does not run. The small items add up fast and rust repair is not for the faint of heart (you can do it but you have to work at it).
Not trying to discourage you, but go in to it with you eyes open.
Where are you located?
Good luck, Rg