Lozza, I agree with ZR on the Mon - Tue split due to recup time... perhaps you split
Mon shoulder/chest/tri
tue back/bicep/
fri full body but more on legs.
ZR thanks, never heard that before but I see the logic, I don’t use the smith machine as a rule, my thinking was it would help stabilise on the heavy lift and concentrate on the “main muscle" rather than stabiliser muscles also, thinking I could get a heavier lift, I would have probably gone for BB at end of day.
So you say it puts your back at an awkward posture due to the one line of motion , do you think this would be the same principle for the sled hack squat machine? Or different coz the back is supported?
the plans not black and white, if more rest is required in betwen days then sit back and relax and carry on where you left off

if time permiting I'll put the core into the main workout as and when it seems good, if the workout is not in the morning then i have more time, like you say the core is worked on legs...
ZR whats your routine mate?