diff --git a/README.md b/README.md
index ec565b4..80a289d 100644
--- a/README.md
+++ b/README.md
@@ -8,74 +8,28 @@ be sufficient but you might want to install
[fasteners workbench](https://wiki.freecadweb.org/Fasteners_Workbench) if working on
a design assembly.
-there are currently version kinds available, DIY (FFF) and DIY+, and possibly
-third upcoming PRO. all versions have generated files like STL, STEP and DXF,
-attached to their respective releases on https://git.qcode.ch/nakamochi/3d/releases
+there are currently designs only for the [NERD edition](https://nakamochi.io/#nerd).
+KAFI version is coming later on. generated files like STL, STEP and DXF are attached
+to their respective releases on https://git.qcode.ch/nakamochi/3d/releases
-## DIY version (FFF)
-
-fused filament fabrication design is suitable for 3D printing at home, located
-in the [fff](fff/) directory. the main file is in [fff/provcase.FCStd](fff/provcase.FCStd).
-"provcase" stands for "provisional case" because it was unclear at the time whether
-this would have been the final version.
-
-the project contains all the parts to make a full assembly with the following BOM:
-
-- [raspberry pi 4 model b][rpi4]
-- [waveshare 4.3inch DSI LCD][lcd]
-- [sandisk portable 1TB SSD sdssde30-1t00][ssd]
-- [joi-it armor "block" heatsink](https://joy-it.net/en/products/RB-AlucaseP4+07)
-- 90 degree angle [USB-C adapter][usbc90deg] 3.1 gen 2, 10Gbps
-- adhesive gasket/seal tape for LCD, 1mm thick, 10mm width, L370mm
-- 4 adhesive bottom pads
-- 4 screws M2.5 L16-18mm for heatsink mount
-- 4 spacers 2-4mm thick depending on the heatsink mount screws length
-- 3D-printed enclosure main box (look for `box.stl` in releases)
-- 3D-printed enclosure side cup (look for `sidecup.stl` in releases)
-
-all object constraints reference an embedded spreadsheet `params` to avoid
-[topological naming problem](https://wiki.freecadweb.org/Topological_naming_problem).
-prefer constraining against datum objects instead of faces and other elements produced
-directly from sketches like pads.
-
-finally, the [fff/provcase-assembly.FCStd](fff/provcase-assembly.FCStd) file contains
-an "assembly" group. this is simply a collection of parts composed together to help
-visualize how and whether all of them fit well together. it links to the provcase.FCStd,
-so you'll need both files. this assembly group calculates all placement offsets from
-`asmsheet` spreadsheet. here's how the assembly looks like:
-
-| | |
-| ---|--- |
-|  |  |
-
-the "assembly" std part has a custom property "view" with two options: exploded and
-assembled. the property is configured from the same asmsheet.
-
-### 3D printing the parts
-
-> TODO: insert here acceptable 3D printer specs and an assembly guide
-
-## DIY+ (plus)
+## NERD edition
this version features a custom heatsink combined with the bottom plate, suitable
-for aluminium CNC milling. the construction provides a better heat dissipation
-compared to the DIY (FFF) version.
+for aluminium CNC milling. the construction provides a good heat dissipation,
+making an active cooling like a fan redundant.
| | |
| ---|--- |
-|  |  |
-|  |  |
+|  |  |
+|  |  |
-
+
the baseplate serving as a heatsink brings down the main CPU temperature
from around 70℃ to 50℃. when measured externally while doing bitcoin initial
blocks download, an IR camera showed around 36℃.
-the main file [diyplus.FCStd](diyplus/diyplus.FCStd) contains all parts
-as well as the assembly. other files in the [diyplus](diyplus/) directory are
-exports from the main file, such as baseplate DXF, STL, STEP and drawings.
-
-a complete assembly BOM is as follows.
+the main file [nerd.FCStd](nerd/nerd.FCStd) contains all parts
+as well as the assembly. a complete assembly BOM is as follows.
**off the shelf parts**
diff --git a/fff/build.jpg b/fff/build.jpg
deleted file mode 100644
index bea85ff..0000000
Binary files a/fff/build.jpg and /dev/null differ
diff --git a/fff/provcase-assembly.FCStd b/fff/provcase-assembly.FCStd
deleted file mode 100644
index 8c2685d..0000000
Binary files a/fff/provcase-assembly.FCStd and /dev/null differ
diff --git a/fff/provcase-assembly.png b/fff/provcase-assembly.png
deleted file mode 100644
index ecfc602..0000000
Binary files a/fff/provcase-assembly.png and /dev/null differ
diff --git a/fff/provcase.FCStd b/fff/provcase.FCStd
deleted file mode 100644
index ac822cc..0000000
Binary files a/fff/provcase.FCStd and /dev/null differ
diff --git a/diyplus/assembly.png b/nerd/assembly.png
similarity index 100%
rename from diyplus/assembly.png
rename to nerd/assembly.png
diff --git a/diyplus/assembly_boxed.png b/nerd/assembly_boxed.png
similarity index 100%
rename from diyplus/assembly_boxed.png
rename to nerd/assembly_boxed.png
diff --git a/diyplus/assembly_ub_exp.png b/nerd/assembly_ub_exp.png
similarity index 100%
rename from diyplus/assembly_ub_exp.png
rename to nerd/assembly_ub_exp.png
diff --git a/diyplus/assembly_ub_imp.png b/nerd/assembly_ub_imp.png
similarity index 100%
rename from diyplus/assembly_ub_imp.png
rename to nerd/assembly_ub_imp.png
diff --git a/diyplus/diyplus.FCStd b/nerd/diyplus.FCStd
similarity index 100%
rename from diyplus/diyplus.FCStd
rename to nerd/diyplus.FCStd
diff --git a/diyplus/ir_1166.jpg b/nerd/ir_1166.jpg
similarity index 100%
rename from diyplus/ir_1166.jpg
rename to nerd/ir_1166.jpg