Thanks, Andrew and David.
Today I made and fitted the table clamps, I did not proceed with the split collet that I mentioned earlier as it is a bit tight for space. Also I liked the fact that the table is pressed firmly down onto the top plate when using clamps.
I drilled a matrix of tapped holes in the table top as suggested by Andrew, I may machine tee slots at a later date, I'll see how I get on with the tapped holes.
I'm surprised at the weight, even though it is mostly aluminium it feels quite substantial.