Forgot to say in the previous post...
Around the edge of the aluminium bed I've put 3x2", 1/4" thick aluminium angle. This acts as a barrier for the coolant, so to ensure it seals I put a strip of 1.5mm thick neoprene under each piece. I used my metal cutting bandsaw to cut the 45° angles, but the finish from this although not bad for a bandsaw, is still quite rough.

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Bit of an unusual set-up on the lathe so I videoed it:



(Something wrong with the sound on the past two videos)