The "through chuck"idea is what I meant by spindle boreApprox1 3/8 in allows a 5-c collet setup,which is a very useful thing.
A taper attachment is handy
A South Bend such as this one,if the link works,is a pretty good gunsmith lathe
I ran one of these for years,stout,precise,rigid,excellent for threading,one of the finest small lathes ever!But maybe more than a hobby gunsmith needs.
In between,this Harrison is a good machine