M1941 Sniper Rifle scope case dimensions

Hello Battle Tested Friends......

Am looking into making a mock up of the USMC M1941 sniper rifle scope case.

Do any of ya'll know the external and internal dimensions of the carry case tube?.....How the bottom of the case
is put together? Photos look like a round insert held with screws.

Anyone who has an original.....what is on the inside of it.....any kind of cushioning/support for the scope
while inside the case?

Thanks!