I just finished my first frame bag and wanted to share my experiences.
-I bought 100x180cm cotton duck fabric (3 USD) (i guess? translate might be off) and barely used 1/4 of it. I have no idea about fabrics but seems like this cotton duck is pretty good for the price. Also paid around 2 USD for straps, velcro, zipper and stuff but also had pretty much leftover.
-As a first timer in sewing corners were a serious challenge for me. I sewed and unpicked stitches 3 times on my first corner because somehow I messed up but finally got the idea. Also broke a needle. It seems like needles can't deal with hard zippers. Makes sense. And I couldn't even count the times when the sewing machine stuck.
-Least expected part for me is the HOLY mess I created there is now thousands of threads and fabrics in all over place and all over my clothes.
-I think bag seems skewed on various sides and each corners has their unique style, it looks weird to me. This thing is the opposite of consistency. Maybe I'm over thinking about it but definitely not perfect.
-I had fun while tinkering on this since I don't start to clean up mess yet.
-I made the zipper panel first and probaly messed up while sewing zipper because now zipper part is definitely longer than rest so it curls awkwardly.
-I didn't sew on the Velcro strips. It was highly recommended on most tutorials but It seemed okay. (I just hope for the best for now)
-I sewed the side panel strap every 4cm to make it a bit customizable on mounting. At least I thought it would be.
-I got rid of the tiny bottom part as suggested on the older post and no regrets on that.
- And about the exposed shifter wires I think they should be fine since bag almost not touching the wires definitely not pushing them. Cables are probably going to be okay but they can damage the fabric over time we'll see.
Here is the older post
https://www.reddit.com/r/myog/s/HCgcsKMzkm