Rob
I made a Tee slotted table a long time ago for a Bantam, it used the 4 tapped holes that are designed for the rear tool post mounting plate and did not affect the top slide use. It was made from a 1" thick cast iron slab.
I used it to hold down a cylinder to line bore, some years later sold it on.
If you join the Colchester iO Group you can check in the Photo section for the fully dimensioned drawing.
Emgee
https://colchesterlathe.groups.io

Edited By Emgee on 26/10/2020 19:18:28
Edited By Emgee on 26/10/2020 19:27:44