Welcome Lee!
I trimmed down almost all of the return edge on my front and back armor:


for connecting the front and back, I highly recommend the flexible rubber strapping:

As far as the pocket flaps, I used the patterns that I got from another pilot on the:https://www.jrs501st.com/forums/index.php
If you havent been to that site, you will find lots of info there. I have the templates, I can email them to you if you want to check them out.
Fantastic references there, that shows I'm going in the right direction, love it! yes please email to me if you can, I joined the jolly rogers and found some template images but they're for some reason incredibly tiny. I'll shoot you a PM little later.
I"m also taking suggestions on the kidney straps. CRL shows it can be nylon webbing or elastic.....I was thinking 1 inch webbing with a buckle on both the inside of the front and back. I figure as long as it's not seen, then there's no complaint right?
tomorrow I get my flight suit and I'm really eager to start working on that. And I work in a graphics company so I'll be using some vinyl material we have to heat press the cogs onto the shoulders. OH! and yes, I have some rubber straps for above the shoulders including plastic chicago screws. I need to just sand my edges before I drill the holes to put those on.
Now I feel like I'm making some progress!