i think maybe if i just got all the plates cut to size and all face sides drilled and tapped by experienced people then when it comes to the edge of the plates i can align all the plates together and mark out the holes from the plates and then just clamp and drill my self using a decent pillar drill. the plates are 25mm thick so plenty of space for 10mm bolts.

unless anyone has a better idea :)

cheers

Ash