I've mostly done my own framing for a long time. Ever since a framing shop wrecked a poster while dry mounting it
This is a group of items from a cyclist who was the uruguayan national champion in a particular race in the 1920's. Poster, photo, racing license and a few medals. I use acid free photo corners to hold the paper items to the back mat and than layers of mat to make enough room for the medals. Those are hung from the very back layer by fishing line sewn through the mat.
Assemble it yourself frame kit to get the custom size, and UV blocking coated glass. The Glass was the most expensive part $25 .
Steve B