No doubt the MB3 from CNCRoom or the Technics equivalent will be fine but they are approx. $180 or 200 Euro respectively.
Neither were available at the time I was building my machine but doubt I would have spent the extra even if they had been.

Craig

At the end we didn't go on with the development of a customized BOB, I would have liked that very much, but...... too much time needed for doing it...
We decided for the 3.4 BOB version from Technics and I already received 2 kits (BOBs + SST);
during this week I install it as well as the MACH4 hobby...