So I was interested in seeing how other people are doing it?
On my Durango & PTC I used a PG battery connector and replaced the hex screw with a post. Attached the PG to the battery and the factory terminal to the post on the PG. Pic attached but it isn't very good, you can kind of see what I'm talking about.
Anyhow, I don't think that will fit under the battery cover on the MS3. Any ill effects of not running with the battery cover?