After installing unconfigured desktop, architect offers to install unavailable packages
After an unconfigured desktop environment has been installed, architect will offer to install packages that are not available on the repositories (such as gamin), making the installation of the whole package set fail.
The list of offered packages is here: https://gitlab.manjaro.org/applications/manjaro-architect/blob/master/lib/util-advanced.sh#L225
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information