dovetails for cnc

I am toying with cnc'ing a small hardinge dv-59 lathe. This lathe
does not have a longitudinal feedscrew so I will have to add a
leadscrew or ballscrew. The bed is a ~3.5" wide dovetail (60
degree) way. I want to machine a mating carriage to ride on this
dovetail. I have the correct carbide insert dovetail cutter on
order, but I am wondering what is the correct way to make the
dovetails and gib. Does it matter for cnc if I make the gib
straight instead of tapered? There is not a lot of information on
why gibs are tapered or how they compare to non-tapered gibs. Also,
I have been told that you need to taper one of the four dovetails if
you use a tapered gib. I took off the cross-slide on my 7x12 lathe
and it just uses a straight dovetail and straight gib. Of course
this may not be the highest quality thing I could have examined.

Opinions? I will keep all my cad files in case others want to do
something similar to a dv59. They can be found dirt cheap because
they are not really usefull to the home shop user as-is.

Thanks,

Rick