You're making it more complicated that it actually is. The instructions for it all may *look* a little daunting, but it's really not, not if you actually try it. Instructions here:
Open up your prefered file manager (I use krusader, but konqueror or dolphin work well enough)
Create a new directory called 'build' (w/out the quotes of course).
Open up your favorite browser
Look on slackbuilds.org for the app you're wanting.
Open that app in a new tab or window
Download the tarball that is underneath 'Download Slackbuild:'
Get to your 'build' directory in the file manager and you'll see the tarball you just downloaded
Right-click on that tarball and choose 'extract here'
Delete that tarball (it's very small file-size so you can get it any time easily even with dial-up)
Now download the source tarball underneath 'Source Downloads:' and put it into the directory you just extracted
Open up konsole and type 'su -' (no quotes, su <space> dash) and hit enter, then enter your root password and hit enter again
CD to your directory of the app (for instance 'cd /home/you/build/new-app and hit enter)
Now type 'ls' (this will 'list' all that is in that directory)
You want to now type './new-app.SlackBuild' (no quotes and 'new-app' being the real name of the app)
Hit enter and it will begin building your new app.
When it's done, type 'installpkg /tmp/new-app.blahblah.txz' (or whatever it is, no quotes)
Your new app is now installed and awaiting your use
Reading all that and the actual *doing* of it all is a huge difference. 'Doing' it is far faster, and once you've done it a few times, it's even simpler and you'll begin to use your own shortcuts to make it even faster. That is the way *I* do the builds. There may be faster/simpler/other ways of course, but that way above works for *me* and I'm used to it and I'm a two-finger typer and have an extremely poor memory (it's also why I can't become a programmer
) and I do not know even how to write a simple bash script...so if I can do it, you can too.