When I replaced the case on my 1962 LG3 years ago, the best fit I came up with was a hardshell case made for a classical guitar. Glassical guitars are not full sized and the littler LG guitar fit in it quite nicely.

It's not tweed, but I believe you will not have a wide range of choices in a harshell case. consider the protection first and the asthetics second.

BTW, I also have an LG0 from 1964 that I had the plastic bridge replaced. I have the original fauz-alligator case for it, but more often use a nice gig-bag, again one that was sized for a classical guitar.