Any sugestions how to build my gantry

[masinecc]

Thanks @silyavski for your answer.
I ll change me I-profiles with squared. Here i am sending an updated picture from my cnc router, you can see that i have designed the x-axis. I use RHS profile 200x80x4mm, which i thing it has stiffnes more than enough.How about to use two squared 80x80x3mm instead the RHS 200x80x4mm? Vertical distance between My linear rails SBR25x1400mm is 150mm(center to center) which is max distance i can get using RHS200x80x4mm. Is this vertical distance from 150mm is enough?( i know that increasing this distance is better coz it reduces force due to torgue caused by the cutting force in y-axis)
Outer face distance between my SBR25UU on x-axis is 220mm, is it enoug?!( i know that increasing this distance is better coz it reduces force due to torgue caused by the cutting force in x-axis)
I havent designet my z-axis yet, after i am done with it i ll upload the pictures. After i design the whole gantry i ll find the center of gravity and i ll decide where to instal the SBR25UU on my y-axis. I know that center of gravity should be in the middle between the liinear blocks SBR25UU.