NOTE: If you want to install the Reiser4-enabled metztli.iso netboot image to a USB device -- to boot from bare metal, for instance:
(sudo)

Shell

where, of course, /dev/sdb represents your USB device

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By selecting Мария as Красивая name identifier for my Reiser4, Software Format Release Number (SFRN) 4.0.1, proof of concept (PoC) Debian AMD64 image virtualized by VirtualBox, I took the following sequence of disk partitioning snapshots:

After the Mictlantecuhtli/Quetzalcohuatl¹ Metztli IT's Reiser4-enabled Debian-Installer splash image and subsequent expert installation procedure, we select to install Unstable (Sid) distribution from menu:

We want to install 'remotely' -- from another virtual machine -- accordingly from Download Installer Components menu screen, we select network-console and openssh-client-udeb:

Thus, we fire up Cohuatlicue-reiser4 image to host the remote Reiser4-enabled Debian-Installer menu and select Continue installation remotely using SSH:

Login from the remote installer with the relevant information provided in the dialog. Please check fingerprints on local and remote host -- they should match:

Select start Installer (expert mode)

Move arrow down in the ensuing menu; remember, we are installing 'remotely' from Cohuatlicue-reiser4. We will pick up our Sid installation where we left off on Мария: Setup users and passwords

You may want to select not to allow login as root -- especially if you will be creating an image for Google Compute Engine (GCE)

As d-i installation routine continues, we arrive at Partition disks and select option. (Note that we have also pressed the right Ctrl+f4 key combination on our installation target Мария VirtualBox image which outputs a verbose overview as the installation proceeds)

At the ensuing Partitioning screen dialog, select Manual:

Select the 'raw' SCSII unpartitioned sda device to modify -- if your virtual disk resource has just been assigned by VirtualBox, of course. The device(s) will also vary depending on whether your installation will be on bare metal system(s) -- in which case you should be extremely careful not to destroy accidentally other existing data. Here, we are merely showing a simple minimum two-partition proof-of-concept

Create empty partition table on this virtual device (If you have previous data that you want to retain and on bare metal system(s) BE CAREFUL -- as this will destroy all your previously existing data)

Select msdos as the partition table type -- as of now I have not tested GPT or any other type.

Select the FREE SPACE to create a primary partition:

From the next dialog menu: Create a new partition

Since GRUB does not support Reiser4, we need a small partition to hold and -- more importantly boot -- with our custom Reiser4-enabled Linux kernel:

We select Primary as type for the new partition:

Location of small primary partition -- at the beginning of the available disk space:

Thus structure of primary partition should be: formatted in Ext2 and assigned mount point /boot. Please see sample snapshot below:

After successfully done creating primary boot partition, select FREE SPACE again to create another partition:

This time we select Logical as type for new partition:

When dialog prompts on "How to use this partition:", select Reiser4 journaling file system from menu and subsequently make sure partition will be mounted at root /:

Please don't modify Label -- leave as default and select Done setting up the partition and press Enter:

Finish partitioning and write changes to disk. Please note the minimum structure to install and boot Reiser4 as root partition:

You will be reminded about forgetting to create a swap partition. If you will be creating image for Google Compute Engine (GCE), you are advised not to create a swap space. Accordingly, use context matters and for a proof of concept PoC we don't need one but in bare metal system(s) you most likely need a swap space. Here, we don't want to go back to create a swap space from the partitioning menu; hence we select No.

Write changes to disk:

Creating Reiser4 Software Format Release Number (SFRN) 4.0.1² file system for / ...

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GNU/Linux Debian on Reiser4, Software Format Release Number (SFRN) 4.0.1, steroids.

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¹Mictlantecuhtli & Quetzalcohuatl-Ehecatl Glyph by Princess Shadyk.

²Indeed, given the fact that I wanted to capture the moment in which Debian-Installer formats the Reiser4 partition, I had to create another virtual machine (and press to activate the copy utility fast!) as in the main screenshot sequence for this post I did not get it.