I thought that $1300 was pretty exxy, but not outrageously so. My own level of interest ran out when it hit $600, but I've already got one....
Wheels are easy enough to get (and even easier to make one out of monoshock DT bits, if its not a showroom resto), and rear inner guard/airbox combos are fairly easy to find (same as MX125).
The frame could easily be fixed with freebie DT parts. (If the winning bidder wants a donor DT frame, then send me a PM).
The rest of it is standard-issue resto stuff.