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I wish you good luck with your try. Don’t hurry. Double check the dome

Thanks for your answer Clive
I know that 5mm thick is enough but as i said,"...After having the gantry milled (a process that went wrong) there was a 3mm deep groove for the master rail.
20313
At...

It has been more than 1 1/2 year that i did any progress
Many issues delay and postpone my work
So it is time to restart
One of the big problems that i had was the steel flatness
I had to have...