Advice please on 100cmx60cm CNC router

[bigal999]

Thank you again for your answers I agree I may have been a bit too fast to buy some of the parts but am stopping now till I have built my frame.
I am having doubts about my frames design at the moment so if you could please answer these questions.
1. X axis will be 40x80 profile 100cm X 60cm. Will I need a center brace at the 50cm point or not. I was planing to brace all the corners with 10mm plate.
2. Y axis will be running in 20mm supported rails.
Would 40x 80 be ok for the side legs to hold up the carriage.
The carriage that z axis will be running on will be 2 40x80 profiles with a 50mm gap for the ball screw to run in-between them . Will they be ok if I put a 10mm brace in the centre between the 2 rails. z axis will run on 2 20mm supported rails one mounted on each rail.
Z axis is still in design stage.
Albert