Progress so far...

OK. So, Iceweasel (Debian's Firefox) died twice while trying to download the SDK. Both times after about 200MB into the 800MB download!

In the end I managed to get the SDK by recovering the URI from the download window and then using wget. I think the URI includes a log-in code, so it would not have been possible without registering etc. even though it's only HTTP, not HTTPS. Anyway, because of that doing something like this is worthwhile (as one line):
- replacing <file> and <md5_str> accordingly. The md5 codes are on the Qt SKD download page.

Now I just need to build the thing!
Oops. Just seen in the rather limited text in the documentation that I should have grabbed the web install version, if targeting maemo5. Dammit.

... OK... tomorrow!

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Edit: 21st Nov:

Finally got a chance to install this. Well, sort of... I have tried the online and offline versions (32bit Linux).They both require MASSIVE /tmp directories. When I set up my machine, I did so with the default LVM configuration - i.e. with a 400MB-ish /tmp partition.
When updating the offline version, the Maintenance Tool wants to use nearly 4GB of temporary space, while the online one tries to use about 850MB.

Just wondered:
- has anyone else has encountered a similar problem?
- is it 100% necessary to alter the partitions on my HDD, if I want to install the Nokia-Qt-SDK?
- how else might I rectify/prevent this problem?