You lucked out, jump on Bowlmans offer. There are so few upper hulls out there. That and the rear panel seems to be the most common missing major part.
Having many leoaprd 1 tanks here and building up 6 of them I have learned alot and where and how to source or make spare parts. The 3d print version is an option albeit a long last resort.
Good luck with your project. is it going to be a Ukrainian one?