OK so after some hiccups with Windows Server 2019 Preview and the dreaded pre-requisite installer (still .NET 3.5 issues) – SharePoint Server 2019 is finally installing.
There appears still to be some trouble with Installing the IIS Role via the pre-req installer. I tried on a fresh Windows Server 2019 installation and it fails configuring the web role of the server… so a manually install of the Web Role and .NET 3.5 (following SP16 process) seemed to get me over the pre-req’s… so onwards we go!