[AM8] MGN12 Z-Axis + 2020 X-Axis w/ Mini V Gantry carrier

I have a [2020 X-Axis mod with Mini V Gantry](https://www.thingiverse.com/thing:2439194) on my Anet [AM8](https://www.thingiverse.com/thing:2263216) and I'm looking to improve Z axis, I like MGN12 like on [BLV's design](https://www.thingiverse.com/thing:2567757) but it's meant to have MGN12 rails on X axis as well, an I want to keep the carriage I have right now, so I'm making parts to make these fit together!

**Update 2018-04-25:** I printed a first version in order to test-fit the parts on