A new modern bunk bed ...

... from nurseryworks that looks modular, I wonder if it's bunkable, like you can buy one bed now and add the second later ...

Duet Bunk Beds by truck product architecture for nurseryworks:

* • stack or unstack beds
* • two cabinets
* • six open cubbies
* • three drawers under bottom bed
* • upper cabinet is accessible from top bunk
* • cubbies become a separate shelving unit when beds are unstacked

As always, the prices are "modern" too:
$2,490 with drawers or trundle
$1,200 bottom bunk with drawers or trundle

IKEA Bed

It's not exactly what we need (I still want some rails all around) but this is one simple clean twin bed (and cheap too, 149$ including the storage boxes) that we found & liked at IKEA after we have ordered the Flexa bed: BREKKE Bed frame with storage boxes