New build with recycled parts on a ridiculous budget 120cm*60cm work area

[Desertboy]

I need to work hardwoods with the machine, Predominately Oak, Walnut and Mahogany. I'm hoping it's strong enough.

I am planning to swap the gantry over to shortest span (Unless I have 0 issues with flex in which case I will keep it this way as it makes loading the router easier.). Originally I was going to have SBR25 on the bottom which is why I made the gantry the longest span with the hiwin's but since that has changed to Hiwin's all round I need to buy another ballscrew 1400mmm to swap it over.

I thought though it'd be best to use it for a bit to decide if when I do buy a new ballscrew if I should just change all 3 ballscrews to 1610's instead and upgrade the 2nm nema's to 3nm ones at the same time.

I've also been toying with when I swap the gantry over buying another set of 1500mm 15mm clone hiwins and having 2 rails per side on the bottom axis. Then making new plates all round and increasing the Z travel to 35cm! This would mean some serious rebuilding which I wonder if it's worth it at some point in makes more sense to build a new steel framed router then upgrade the old aluminium one.