I got this lovely, very good quality frame from https://emmalinebags.com/products/small-sew-in-rectangle-purse-frame and decided to make another "Love" coin purse.
Because the frame is a bit smaller (7.9cm) than stated in pattern i did adjust fabric lining seam sides (see pic), sewed 13mm away from edge instead of 10mm. Then fabric sitted inside very well.
As I used blue King Cole DK yarn I didn't double it up but used 3mm hook and it matched the pattern template size and stitches perfectly. As for crocheting sides together and sewing onto frame I used Rico essentials crochet yarn doubled up and 1.75 mm hook.
It is not one of the easiest projects, but the result is well worth it!
I love the design as it is more convenient and easier to reach for coins, compared to round purses.