I'd say you'd be best off just getting a $100 sub from one of the TDs and pulling it apart. It won't come out even close to 100% correct so there is no point in investing money in something you might ruin.
You can certainly buy replacement dials, however, they are in addition to the dial that comes on the watch, rather than instead.
Best thing to do is have a look in the Vintage section of the forum, I've done a couple of builds which I've detailed in there, and Bonsey has done loads. Everyone lists what parts they've used and where they come from, so you can easily come up with a 'shopping list' that way.
My first build I bought a watch, replacement crystal, gen spec spring bars, replacement bezel assembly and insert, and then went at it. It came out well, it is a 1675 GTM which I have to stop myself wearing everyday so my other watches get some wrist time!