I also make prints. Normally these are either in A3 (297 x 420 mm) or A3+(329 x 483 mm) format or customize the photos especially on the wide angle photos.
These are printed with an Epson printer on Canson Baryta photographique paper.
I can attach these to a Cappa-line board about 10 mm thick and put an black aluminum frame around it. No glass in the frame are used due to reflections from the glass in the light. It actually becomes pretty nice that way.
Other options is to customize the photos to print directly to aluminium (Dibond (dilite) 3 mm thick - white), acrylic 5-10 mm thick or to pvc board 3-10 mm thick.
Feel free to get in touch if some of this interests you....
Cheers
Thor