Top work excellent finish, I like the design. My attempt at a power hacksaw failed, i tried building one with 12" I beam stand and an inch box section framed top and slide, i even went as far as buying a 60 rpm geared AC motor. Sadly my ambition out weighed my ability and it cut great dog legs.
It looks like you have butchered a lathe head stock for the drive is this correct.

Its a fantastic build, all praise to you - it looks like it will serve you well.