I'm building frequently ar71xx custom, usb_large images without tor, openvpn, bwmon and webmon.With this build you can have 2MB nand free space on root.I will write a changelog for newest builds after this.
root@Gargoyle:~# df
Filesystem 1K-blocks Used Available Use% Mounted on
rootfs 2240 228 2012 10% /
/dev/root 4864 4864 0 100% /rom
tmpfs 14652 84 14568 1% /tmp
tmpfs 512 0 512 0% /dev
root 14652 108 14544 1% /tmp/root
overlayfs:/tmp/root 14652 108 14544 1% /tmp/root
/dev/mtdblock3 2240 228 2012 10% /overlay
overlayfs:/overlay 2240 228 2012 10% /
Lastest custom build's svn version is df33941
Custom firmware files are hosting at yandex.disk.