Thanks for the write up! Hopefully some new fledglings will give it a go. There are just as many small features as big ones that we could use some help on!
I wish this was a week earlier too, I was initially stumped with the maptool/launcher subprojects and Eclipse hiding the source directories on me. Then I realized I just needed right to click on the maptool/launcher directories and create a new project. Oh course, the import Gradle project looks easier, I just did it the harder way I guess.
I've been posting any other issues/gotchas/questions over in the topic Contributing to MapTool 1.4
but this may be a better place going forward to discuss Eclipse specific issues/tips then. (Mods, fee free to split/move any appropriate posts to here).
Also, I've been having moderate success with eGit for Eclipse. It works ok for checkout, commits, intial pulls, etc. But when it comes to fetching back from upstream and merging back to master, it didn't go well and found the command line to be better.