That motorized carriage and the R-8 collet capability were the big things that made me drool over them.
That collet capability should make adapting to Morse taper easy too.
I seem to recall that they had a hollow quill like a metal lathe spindle but then again that may be just wishful remembering.
I thought that there were maybe some interesting Shopsmith possibilities on this page:
Note that I didn't check on pricing, I was afraid to...
I did not equip with Shopsmiths in spite of the setups but because of them.
1 1988 - Mark V 510 (bought new), 4 Poly vee 1 1/8th HP Mark V's, Mark VII, 1 Mark V Mini, 1 Frankensmith, 1 10-ER, 1 Mark V Push-me-Pull-me Drillpress, SS bandsaw, belt sander, jointer, jigsaw, shaper attach, mortising attach, TS-3650 Rigid tablesaw, RAS, 6" long bed jointer, Foley/Belsaw Planer/molder/ripsaw, 1" sander, oscillating spindle/belt sander, Scroll saw, Woodmizer sawmill