aware of it as a maemo alt....yes...
fiddled with it on an n900 yet?
no.

"Back camera is close to supported in 4.14-rc1.

Voice calls work, but needs https://gitlab.com/libcmtspeechdata/libcmtspeechdata and has poor quality

There's bluetooth support at bluetooth-next, but that works on N950, not on N900. Bluetooth . There's a driver ported to 4.13 at bt-v4.13 tree, git.kernel.org, linux-n900

WiFi settings do not work across reboots
The MAC address of the N900 WiFi interface its being randomized at every boot, since the connection profile created with nmtui is bound to the MAC address, it won't work at the next boot.

To solve this, after connecting you can use nmtui to edit the created profile, and remove the MAC address from the "Device" section

Without NetworkManager
If NetworkManager should not work for you, make sure that it is not running and run the following commands to connect to an encrypted network manually: ....

Battery Protection
Currently, when battery gets below suitable operating voltage, the device dies. This is bad for the battery and the file system. Here is a script that monitors the battery, and powers the device off before the battery reaches critical state. For suggested usage, read the program's comments..."

and Hildon is pretty much a lost cause for use on postmarketos on the n900...


All in all...
Not bad...a little rough around the edges ...with the cam, connectivity issues and battery monitoring protection.

If one wishes to use their n900 as a different device ...that is...than familiar hildon...

They fix those few issues and it is pretty much prime time...as an os alt.