iFixit Q&A forums are not the place for rooting and updating Android devices to unofficial ROMs. Instead, please head over to XDA-Developers, as they already have well documented Wikis for this subject matter. iFixit has no relation to XDA-Developers, nor is iFixit responsible for the content of that website and the problems that a custom ROM may introduce. That being said, please view the following Wiki at your own risk.
https://forum.xda-developers.com/wiki/Acer_Iconia_A200