We'd certainly could use of a feature in the capture install scripts to restart the build in case if fails, instead of resuming all the installation. In our Atom box, it's painful since it takes a lot to re-run the whole process.
It doesn't take so much to include a question "Do you wish to retry?" after a failed build for the user to decide if they want to try again (because, for instance, a temporary failure in the internet connection prevented maven from downloading necessary sources). As the compilation is done in install.sh (and not in one of the subsidiary scripts), we could even go back to where the source is downloaded, so that the user could choose other url and re-download the code again.
How does that sound to you?