For accessories, Sofirn is offering a carry case for the light, but as of right now there are no other official accessories. The planned accessories are still in the design phase, and the designer is currently recovering from complications with having the COVID-19 virus the last couple months.
If you check out the original LT-1 post, the last couple pages have folks showing some items they use with the lantern, like shades and such : *BLF LT1 Lantern Project) (updated Nov,17,2020)