I have almost finished building mine, just got to complete the leadscrews. Busy finishing off the wooden baseboard to mount it and the grinder.
Quite a lot of work but seems worthwhile as it's an awful lot cheaper than the commercial alternatives. Cost of them would buy a hell of a lot of (sharp) new end mills……
Just need now, to experiment with vee block and clamp, rather than make Harold's end mill holder, which seems like anothe small marathon.
Got a decent looking white cup wheel fitted on grinder, so nearly ready to go with better shaped lathe tools to start with, then follow up with end mill and slotter grinding experiment.