Color me interested - been looking for a good camping light, and your OP post seems to lay out everything well as far as features and design choices go.
The only thing I’m left wondering about is what the estimated weight will be like, given a full metal body and quad 18650. Hoping it’d still be suitable for backpacking and not just car camping =D
I have no idea what the projected weight of this light is. However, FWIW, the completed SRK I modded into my version of DBSAR’s lantern weighs in at exactly 500 grams with 4 Samsung 30Q cells inserted.