All,

Dead pages come back to life sometimes... The TDE wiki at https://wiki.trinitydesktop.org/KDE3_Tutorials lists the original link as dead for:

Development/Tutorials/KDE3/Qt Designer and KDevelop 3.0 for Beginners

It has been resurrected under:

https://techbase.kde.org/Development/Tutorials/KDE3/Qt_Designer_and_KDevelop...

I just happened to run across it and I thought I would pass it along. It appears a bunch of the KDE3 docs are in mediawiki form (not that they were all that complete at the time). Anyway, there may be one or two more that are helpful from those listed at:

https://techbase.kde.org/Category:KDE3

Keep up the good work!