The specs on this Hiscox case look real good in terms of fit, haven't tried it though:
https://hiscoxcases.com/products/lar...se-pro-ii-spec
Also two cases by SKB look to be a good fit, but again haven't tried them:
https://www.skbcases.com/products/th...xe-guitar-case
https://www.skbcases.com/products/00...ic-guitar-case
For me the first one for a classical looks to be the better fit, but Sweetwater recommends the OOO case for the GT, but perhaps they haven't tried the classical case which is a little shorter for guitar body and overall length. They have others they recommend for the GT.