Sub-table for a Bridgeport mill...

[Davek0974]

I'm almost ready to move my smaller parts to my Bridgeport conversion from the mini-mill. The spindle mount adaptor is made and the wiring/programming should be good to go. The bed needs to be about 350mm x 450mm

This is my mini-mill with a just-finished part still mounted, I need to make a sub-table to replicate the bed of the mini-mill on the Bridgeport.



So, what would i be looking at here? The existing bed is 15mm ecocast but is sitting on a 15mm slab of cast iron which is bigger than the sub-table. The Bridgeport has a relatively narrow table at 230mm so the sub-table will overhang, max rear overhang is 20mm so more to the front. This lump of MDF is about the right size, sitting on the mill...



Now, I have about 5 parts i make occasionally, none in quantities big enough to deserve a custom fixture plate so the universal sub-table seems the best way forwards?

What sort of thickness here?
Would it need support arms underneath for the overhang?
How to mount easily onto the Bridgeport?

Better idea?