Whilst i am here....

.... I have been thinking about how to tackle the bed design. Initially it was going to be steel frame with an ally plate then strips to make up t slots however I am now thinking why not use the steel frame (60mm depth from the box section) as th catch tank for the coolant?

So box section steel frame which is the moveable bed. 20mm thick aluminium strips running 90 degrees to the box section cross members. either an aluminium angle edge maybe something like 4"x1" to prevent some of the splash getting everywhere or just some 3mm steel flat bar on its side welded round the edge. Then on the bottom of the steel box section a sheet of something like acrylic or polycarbonate which is sealed against the bottom of the frame (rubber gasket and a silly amount of bolts) obviously I would need to create some sort of fall so the coolant went back down towards a collection spout.

Would this work? or is there a better way of doing it? Apologies for all the questions today had a boring job to do which required very little brain power!