A) Looks good and I like the criteria you have used, especially to prevent the bags going up in smoke at the exhaust. What have you actually done there, not visible on your pictures.
B) The one issue I have had with the clip in buckles is that they all end up breaking when you try to keep the bags nice and tight against the bike. Maybe your design is an improvement for that.
C) I am not sure that the glueing of the bags is a better solution that the welding. My limited experience with rubbernecks include a lot of reglue-ing.
D) And one issue that is not listed in your criteria: an easy way of carrying them when you take them off the bike. Staggering into a hotel with filthy bags over your arms and no free hand to open a door has never won me any friends. So maybe consider a shoulder strap or something similar to assist here.
Good luck with the development of these.
Price will be around R 3 600.00 incl. at max. Looking at what you get and what's available in ZA we think that is well well priced.

Availability. I am a big fan of 'co-operative' development to finally produce a better product. We will probably manufacture the first 3 sets for ourselves where we will iron out the manufacturing and quality issues. The next few (probably 4) sets will be sold at a 'development' price. So, to answer your question about availability. The first sets must be available by end JUNE 2017. (ek gaan my gat af moet werk

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@Amsterdam Answers
A) A 'plastic' sheet will be sandwiched to the back between PVC. thickness and type to be finalized. (Currently I just have hardboard on the inside

B) It is a concern but the YKK is well designed and world renowned for strength. The buckles attaching the bag to the frame is also removable so can be replaced without tools. The 'attachment' buckles will also be 50mm and not 25mm as per current sample.
C) Ultimately we will go for high freq welding. Unfortunately the design must be 'complete' before tooling can be designed.
D) Oops forgot to mention Carry strap. (Yup, that is what I call 'co-operative development'.) Two options will be included. 1) A 'handle' that will slip over the two top straps - not visible on the pics - that will always be in the center of the bag irrespective of how 'full' it is loaded. Removable if you do not need them, 2.) A Shoulder strap that clip in the D links. (Now, where to keep this while riding and no need to open the bag to 'get them out'

Nou moet ek eers bietjie werk.
Adie