Hi Wes/all,
Sorry for not updating.
I will be honest with you. The 60mm motors vary slightly from manufacturer to another and thus the design of the cover is a bit more complex to make it fit on any 60mm frame. Nevertheless, there was developed a design that would fit theoretically on any 60mm motor. However, unfortunately, based on the sales numbers of the NEMA23 we can't go into mass production with the 60mm ones. Furthermore, based on the poll results (
http://www.machsupport.com/forum/index.php/topic,13593.10/viewResults.html ) NEMA23 are the most popular motors and 2.5 times more popular than 60mm - this data is also confirmed by some leading motor distributors in the US.
All this makes me wonder if it's worth going into mass production with the 60mm frames. So again, the situation at the moment is that there is a design but no motive of going into mass production. Really hope to see it changing

Might suggest a limited stock CNC machined, but then it will mean a higher price and will have to change the design.
Thanks,
Daniel