At last, it's installed! I managed to install the SDK by creating a 5GB folder with dd, then mounting the new folder on to /tmp.

To install the Maemo 5 toolchain, I used the package manager from the Maintenance Tool. However I can't get any Maemo 5 options to show up in the toolchain menu, only Maemo 6 (i.e. Harmattan). Nor any other menu.

Also, the Maemo folder that the Maitenance Tool installs contains the folder 4.6.2 - not 4.7.4 - why? Is this correct?

...anyone have any ideas?