think i am going to make it about 400mm long maybe 500mm depending what i got lying around.

just need to know what size tonage jacks should i use? looking to bend anything up to 8mm over the 400-500mm though it probably wouldnt be likely i would need to do this but i would like to have the capabilty there.
just for using around the home making stuff up. i would say mainly 3-5mm steel, aluminium ect
just a side note would a pressbrake be able to bend 1-1.6mm stainless sheet?

and what spacing do the bottom dies need to be?