My next CNC mill

[RsX]

So I've been tinkering some time with this design and this is what I came up so far.
The machine has a working area of 500x200x250 (X, Y, Z), the box in red in the pictures.
It is inspired by a BF20 and that is why it has a BF20 MT2 spindle on it.
I used HGH/HGW20 linear rails, 1605 screws and 3Nm nema24 motors (4Nm for Z).
The base is made from raw aluminum extruded plates and a couple of 90x90 aluminum profiles. The idea is to bolt the base together then lap and scrape the guide rails seats against a granite surface plate.
The same goes for the Z column.
For X axis I'll probably use a milled aluminum plate because it is very long. Then bolt 2 or 3 T-slot plates, and that's where I fear it will probably warp.
I'd like to build it using my 300x600mm CNC router, that's why the Z column has a spacer and the T-slot plate is not as long as the milled plate.
What do you think?

[cncdrive]

That looks an interesting project, but if you take my advice make it one size larger, size of BF45.
We built some of these: https://cncdrive.com/HBM45CNC.htm
The size of this machine is much more useful.