Archived in https://github.com/jenkins-infra/helpdesk/issues/3126. The project wasn't completed. The main idea behind the project is to build a customizable jenkins distribution service :package: that could be used to build tailor-made jenkins distributions
Currently the war file download points to the local host and it should actually point to the correct API https://github.com/jenkinsci/custom-distribution-service/blob/f272873e843ad8973129b3657fc11ad4f08fcf4f/frontend/src/components/PackageGeneration/Editor.js#L60