I assume you guys are building packs for use in some other arena, what area is that? I ask since you said this is your first build.
Why did you choose this cell specifically? The most common esk8 18650 cell is the Samsung 30q.
If you feel like people are coming down hard, its because they are but it is with reason. Almost every component commonly used in an esk8 build has been tested and vetted for performance and reliability. Battery packs are the exception since they are almost always either hand built or china sourced. Both options come with inherent issues. Also and unfortunately there is a history of sub-par battery packs making their way to market because the margin on battery packs is pretty good therefore attracting builders who are after the profit without delivering quality product.
People as asking about sharp nickel corners, fish paper, etc. because these things have proven to be important in battery packs for esk8. So maybe a little less push back and a little more documentation of build history & capabilities. With the current info in this thread, the fact that you guys are brand new here and the first thing you do it open shop, and that your 1st build is brand new there isnt a lot to inspire confidence.