Binaries for a setup behind corp firewall and proxy

I'm currently deploying Zeppelin for a customer with corporate firewalls and proxies everywhere.
Zeppelin fails at startup because of npm download.
It seems that proxy parameter at system level (http_proxy env variable) is not used when downloading npm.

Essentially, I would like to have a full standalone binary of zeppelin without any additional download at startup.

If this kind of additional download is unavoidable, Zeppelin startup script should at least follow the proxy setting.