I'm glad the install went smoothly for you! Thanks for the feedback!
There is a bunch of back-end work that still has to be completed to support diskless booting/detection of amd64 vs i386 diskless MDs. For now you can boot i386 diskless MDs on the amd64 image. It is on my list, but not at the top right now. Patches are welcome for the interactor and the diskless create process.