really you can stitch 70.000 full resolution photos?
on what computer?
On any- if you have a big problem divide it into parts... old computers may just take a bit longer and need smaller parts..
The accuracy they have reached on stitching suggests that the result is in some way closer to 18 Gigapixel than 365Gigapixel
Update
the quality of the outcome could have been better if they had used a 36Mp Nikon or the 50MP Canon with a 300mm lens- this means less stitches and less time ( so less problems)
or using the same 400mm lens and turn the record into about 500-700 Gigapixel