@katherined Thank you!
It just has a simple black fabric lining (I didn't weave the lining, I actually got a few yards of good-quality-but-cheap fabric from a local thrift store).
I did use the antique sewing machine to sew the sides and also the box stitch for the bottom of the tote. Since there was no interfacing at that point the thickness of the fabric wasn't much of an issue.
The rest of the sewing (the hem and handles) I hand stitched, which was pretty tough w/ the interfacing.