Thank you for the amazing work, now I see the true light. Soon, I will be able to say "I use Hannah Montana Arch(btw) GNU/Linux btw", and help other Linux veterans and noobs alike to discover their true calling in this wonderfully made version of Linux.
Spot on, i used debtap to convert all the deb packages to PKGBUILDs.
Compiling from source seemed pretty difficult to do, kde4 was a mess and old documentation was often half-baked or completely broken
I downloaded a regular gnome ubuntu iso and captured the apt package cache/details. I then copied that to a different instance of apt, pointed it to ubuntu's archive and asked it to install kubuntu-desktop using the --download-only flag. Voila, I had every .deb file I needed!