This campaign is by A1200.net who also made the Amiga 1200 Cases. They now use IndieGoGo, also with a fixed goal so no risks there, but it seems the Campaign now runs longer (45 days) and it is easier for them to make perks and bulk buy options and that makes sense really.
There is about a month left to join in.
https://www.indiegogo.com/projects/new-compatible-case-for-amiga-500-plus#/