GRR Bag To Velo BAG Design?

I mentioned in my last post in the Vizor thread on BROL that I had drawn up an design for a GRR seat bag last winter, but never had it made. Materials to do 2-3 would have been around $100. Plus a seamsters time. Here is the design. I have been wondering if I should make it for my velo. What do you think. Lets sorta do a group velo bag design and see if we can get close to a consensus. Who knows maybe a bag company will do it up for us.