Well drat! Abnatha and I just went in on an order and I’m seeing stuff there that I may have to order as well!
The stacking modular stuff is very interesting – There’s a set out there that stacks interior-detailed stuff that way, but it’s more for 10mm with basis (or 15s with v-small bases). When I get some of yours I’ll no doubt be wanting to make an interior in all my copious free time. ;-P