I am not sure whether this is the cause of your problems, but 
module_name         => "$distro/lib/Mymoddir/Mymod",

[download]
seems wrong to me. The name should be something like Mymoddir::Mymod, see module_name at Module::Build::API.
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: Cannot create distro with Module::Build by choroba
in thread Cannot create distro with Module::Build by GUIfriend

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