I would like to cut some brass/aluminum and came across this https://www.aliexpress.com/item/33008529077.html

I was holding out for the new bantam tools machine but was a little unimpressed for the price. I am comfortable tinkering around and have already build a modified Seninci LongMill for wood. I am also playing around with the idea of a 6040z base and add servos/spindle. I just need one dimension to be at least 400mm any ideas?