I stumbled upon this website and this looks like an excellent product for modding!
Its 10mm aluminum T-Slot. Its $8.40 for 900mm(35.4" or $10.00 for the black anodized version. There are different connector plates and end caps and everything is held together by standard M3 screws. Ive used 80/20 to make a few things here at work and I love it so I'm excited to see a miniature version. You could make a full case out of the stuff! Just thought I would share my finding!