Hi
for the spindle i would search and do an pneumatic open close collet. Isn't it ? There you get from the vendors proven systems and integrate them
To build an spindle you need a very good an accurate lathe ,.. (and you have an optimum lathe as far as i know ) so maybe it makes sense to buy this stuff and have then the ability to do little series as fiddling around with the stock itself ,.. ?
look at bison or similar types