OpenWrt 18.06.2 Build TL-WR841N(D)

hello I'm new on OpenWRT
I tried the Buildserver here: https://as-test.stephen304.com/chef/
I want to get a target firmware where I got ~360kb space left for installing zerotier package from here:
https://github.com/mwarning/zerotier-openwrt/releases zerotier_1.2.8-1_mips_24kc.ipk.
well there is a zertier package in the lede 17.0.5 repo and I got a working build with the package from the repo, but the I considered that the package from the repo is very old, and the zerotier wiki tells to use a version later 1.2.4, in the is 1.1.4.
Is there any solution to include the zerotier ipk file from github? I use my wr841n-v10 just in client mode for internet access by wifi, so the ppp stuff I didnt need. Can you tell me how to use your builscript with the minifiers etc but without sqm qos adblock etc, therefore the zerotierfile from github included, or if its more easy to build the zerotier from source within the firmware image... plz ?

Hello,
I just installed this version of LEDE for my wr-841n, however when I tried to configure the dynamic dns under services it doesn't update my dynamic dns with freedns, Also I noticed the password field doesn't keep the password that I entered which is the token in direct url link from freedns. Any help would be greatly appreciated. Thank you.

Hello, can update link download.

@patchez Is this build still maintained?

Build no longer maintained