OK, my design is coming along nicely now (will post some drawings later) and finally settled on a bed size of 1000 x 600.

I was intending to use a slab of 20mm aluminium plate for the bed but realised that getting it machined square and then working on it afterwards may be a little tricky so I have gone for frame type design instead.

This means I now have a big hole were my bed needs to be! Like the idea of aluminium extruded bed plate with T slots but can't find anything that will fit as I want it to, or do I just use MDF or a 10 or 15mm aluminium plate instead and drill holes for work holding??

Just can't make my mind up, does anyone know of any other suppliers of aluminium bed plate other than Marchant Dice?