I'm working on my design for a new CNC wood router. I currently have a small wood router cnc I built last year, but it's a different design and I'd like to build something better. I've pretty much bought all the mechanical and electrical parts already, but I have not started cutting or building anything yet. I'm looking for advice on my design. Here's the general design sense:

- I wanted to have at least a 24" x 48" working area.
- I'd like to have around 6" of Z clearance and I want to have an optional rotary axis eventually
- Will be mostly for cutting wood for a side business we have. If I can cut aluminum that's a bonus.
- Trying to work within a reasonable budget - need to use some cheaper materials such as MDF instead of making it all metal.

For the X-Axis, I have (4) SBR 15-1500mm linear rails and (2) SFU1605-1500mm ballscrews
https://www.ebay.com/itm/SBR-15-1500...72.m2749.l2649
https://www.ebay.com/itm/Ball-Screw-...72.m2749.l2649

For the Y-Axis, I have (2) HGR20-900mm linear rails and (1) RM1605-900mm ballscrew
https://www.ebay.com/itm/2X-Linear-R...72.m2749.l2649

For the Z-Axis, I have (2) MGN12-400mm linear rails and (1) RM1605-300mm ballscrew
https://www.ebay.com/itm/ZYLtech-MGN...72.m2749.l2649
https://www.ebay.com/itm/ZYLtech-Pre...72.m2749.l2649

I also have some 25x50mm aluminum extrusions to work with (5 pieces that are 1000mm or so in length)
For my motors, I have (5) NEMA 23 2.8A 269oz.in stepper motors and TB6600 drivers
This is my spindle https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
I have an Arduino Mega2560 R3 + RAMPS 1.6 board for controls
I have bolts/screws for hardware and 12VDC & 24VDC power supplies, wire, limit switches, terminal blocks, etc for all my wiring and controls
I plan to use 3/4" MDF for the main structure and bed. I plan to use the aluminum extrusions I have for the Y axis horizontals.




My main concern in the Y axis vertical gantry plates. I can't afford thick aluminum plates, so I'm hoping to use 3/4" MDF and keep it stiff by having the dual rails on both sides of the X axis and using aluminum extrusions for the Y horizontals.
Can anyone evaluate my design and let me know what you think? I've attached a picture, but I can also upload a Fusion 360 design file if that helps.