Hey there...my kit is KS and the TD is a bit larger. I think you are on the right path by putting something underneath the greeblie. Maybe an ABS strip and/or double sided tape. Provided you have the greeblie and it looks good, you should be fine. Hope that helps!
Hey there...best to post a pic of what you are working with on your end. IMO...contact SC and see if you can get a holster from them. I'll PM you some details...
Looks great Adam, congrats on your build.
The only feedback I can offer is to add webbing on the join spot for your chest/back parts. It's typically 2" nylon webbing or other clothe, wrapped around where the chest and back come together at the top.