I have just finished making a custom frame bag. The secret to me being able to create this bag was sail makers 9mm wide double sided tape. This stuff is fantastic, and if you are not using it already, I would really recommend trying it. I have included some pictures below to show how I used gross grain on the end of the Velcro straps. I did all 9 of these in under 40 mins. Imagine how tricky it would have been using pins!
I didn't use a single pin on this bag, and from now on, I don't intend again :-)
Side panel 1 with double zips
Side panel 1 with Velcro divider
Photos showing how using tape makes your life sooooo much easier! I bought the tape of ebay
Ready for sewing
End result
The magic tape
The completed frame bag