hi, after using another modified version of slh-source.sh a linux-custom-patches-2.6.18.1-slhup2-lat_2_i386.deb appeared. I dug in it and I saw it's the same content that the patches/ folder. I think I can ignore it and just install hearders and image, right?

@ mzilikazi

1st. Thanks for this description and for keeping it up to date. It's now easy to built a kernel and I am doing it know the third time.
My question does not concern the rt-kernel itself but problems with more than one kernel installed: Did you ever expirience the problem that you could use X only with the last kernel you reinstalled the nvidia/ati driver for? i. e. you have two kernels installed, K1 and K2. After you install the nvidia driver with K2 you don't have X when booting K1 and vice versa.
Although there is a solution ( you have to built the nvidia modul in a certain manner ) I would like to now whether or not this problem is common, and if so, whether you know a solution to avoid this.

Here
is a rather generic .config file for you to download if you like. Sorry - not confirmed that it works for latest 2.6.19 series.