I've modelled a project box for the X-Pro controller board that can mount on to v-slot rail using t-nuts. There is a lid, as well, to close up your box.
The file(s) are publicly available on OnShape. So you only need an OnShape account to copy it, edit it or export it. If you're already a SolidWorks user, you can download the box and lid as sldprt files. If you're the trusting and/or not proficient in CAD, you can download the stl files of the box and lid for 3D printing.