@robteed I’m still early in the design process, but I think you’ll be safe with the T-slot aluminum. I’m still using that in V2 and it’s working great so far.
If you’re thinking about building V1, I’d recommend getting in contact with @AACALibrary who are the only ones I know of that have built one. They made some modifications which are detailed here: Image Sensor / Optical Components - #89 by AACALibrary