TOR/VPN/SOCKS and something else

I hope someone can help me. Im looking for way to build my own TOR-box
with docker and without any influence to the host system. So I use
debian-image as a base and already made TOR working with proxychains.
But I don`t like this way and trying to make it transparent. So I trying
to make VPN server (OpenVPN) inside container, make it work through
TOR-SOCKS and connect to it inside container.

But I guess, here the same problem like with IPTABLES, thats not
dedicated enough. So Im stucked on starting OpenVPN step with
ERROR: Cannot open TUN/TAP dev /dev/net/tun: No such file or directory (errno=2)

So, can anyone help me, or suggest something ?

PS Sorry for my english, thats not my native language.

ok, I handle problem with TUN by myself with --cap-add, but I still don`t know how to use VPN with TOR. I guess privoxy can help me ?